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This trope refers to songs that have lyrics or music that change significantly depending on who is in the group or if the singer goes solo. They may do their own version of songs they originally performed with the band but keep the same tune and probably the same lyrics.

They may also be a song about a particular event in the writer's life; the lyrics may change if the situation changes.

Groups may also decide to change the lyrics or arrangement of a song even if there hasn't been a change, just to keep it fresh or if they decide to go in a new direction artistically.

If a TV show is a LongRunner this may happen to the opening theme between series, though generally these only affect the music, and any lyrics will be unchanged.

Theatrical productions may also change some elements depending on the country it is being performed in: for instance, if a lyric refers to someone who is well known in the show's home country but is an unknown in other parts of the world. Equally, if a show has a modern setting and refers to current events, then lyrics and lines may change once those events are no longer in the news.

Compare EvolvingCredits.

''Note: The TV example does not apply if a show has totally new music for a new season like ''Manga/{{Bleach}}''; only if it's a new version of the same music.''

!!Examples:

[[foldercontrol]]

[[folder:Anime & Manga]]
* ''Anime/AngelBeats'' applies this trope to its opening theme in episode 4. ''Theme of SSS'' also got an epic rock arrangement which is used in tenser situations.
* ''Anime/NeonGenesisEvangelion'' used different versions of ''In Other Words'' better known as ''Fly Me To The Moon'' as its ending theme.
* ''FreshPrettyCure'' and ''SuitePrettyCure'' both remixed their theme songs after their respective {{Sixth Ranger}}s' debuts.
** In addition, the opening theme of ''FutariWaPrettyCureMaxHeart'' is a remix of the original ''FutariWaPrettyCure'' theme.
* ''Anime/SailorMoon'' switched to a different cover of its opening theme for its third and fourth series (and used a different theme entirely for the fifth).
* ''Manga/TheWorldGodOnlyKnows'' has the respective capture targets doing the ending song when they're in their own story arc.
* ''InfiniteStratos'' whenever one of the five girls entered the harems their seiyuu would join in and [[DoItYourselfThemeTune sing the ending]].
[[/folder]]

[[folder:Film]]
* The ''Film/JamesBond'' [[http://www.youtube.com/watch?v=6IdDl-pHeDw theme.]]
[[/folder]]

[[folder:Live Action TV]]
* In the fourth season of ''Series/ArrestedDevelopment'', the episodes are all centered around individual characters, and each character gets their own remixed version of the theme used from seasons 1-3. (The OpeningNarration also changes accordingly.) [[spoiler: These versions are then mixed together in the season finale]].
* ''Series/CoronationStreet''
* ''Series/TheCosbyShow'' changed theme song every year. It was the same tune, but it was arranged in a different musical style every time.
* ''Series/{{Degrassi}}'' (The Next Generation): After about the fifth season they kept changing the theme song to have a different singer or an instrumental version.
* The original recording of ''Series/DoctorWho'''s theme tune went under subtle changes from 1963 to 1980 before being done from scratch in later years. All Doctors apart from the Fifth have had a new piece of music arranged for them.
* ''Series/EastEnders''
* The ''Series/LawAndOrder'' shows all have the same ThemeTune with different tweaks to the arrangement so viewers can tell the main show from ''[[Series/LawAndOrderSpecialVictimsUnit SVU]]'', ''[[Series/LawAndOrderTrialByJury Trial By Jury]]'', or ''[[Series/LawAndOrderCriminalIntent Criminal Intent]]''.
* On ''Series/MisterRogersNeighborhood'', Fred Rogers made some changes to the way he sang "Won't You Be My Neighbor?" fairly early on - the rhythm of the first two occurrences of "would you be mine, could you be mine" changed, and he began slowing down the tempo for the "Let's make the most of this beautiful day" part.
** Also, "It's Such a Good Feeling" was initially in the rotation of songs that Fred would sing in between the opening and closing songs, but became the closing theme for all episodes (save for two operas) beginning in 1972. There were some changes made - the lyric "I think I'll grow 12 inches today" gave way to "I think I'll make a snappy new day", the second verse was omitted, and a shortened version of "The Weekend Song" (which was previously used to close Friday episodes) was added as a coda.
* ''Series/MysteryScienceTheater3000''. [[http://static.tvtropes.org/pmwiki/pub/images/mst3ktreeuc4.gif Here]] is a handy flowchart tracking all the permutations of the theme music.
* ''Series/TheOC'''s theme song got longer after the first few episodes, as some actors who were originally just guest stars got contracts and had to be added to the credits.
* ''Series/PowerRangersZeo'' used a [[RearrangeTheSong remix]] of the ''Series/MightyMorphinPowerRangers'' theme tune with new lyrics. ''Series/PowerRangersSamurai'' uses another remix, which adds the line "Rangers Together Samurai Forever", and removes all references to "Mighty Morphin'". The seasons in between are not an example of this trope, as they had completely new theme tunes.
** ''Series/PowerRangersTurbo'' also had a remix of ''Mighty Morphin'''s tune titled "New Rangers to the Rescue" during TheMovie. The symphonic version played a few times during the season, but without the changed lyrics it's hardly different enough from the original for people to notice without being told.
* ''Series/QuantumLeap'' had its theme music remixed for the fifth and final season.
* ''Series/SesameStreet'' kept its main opening and closing theme songs unchanged for 23 seasons (outside of the pilots which had a longer version sung by Bob [=McGrath=]). Then Season 24 (1992) brought about new arrangements in a calypso style. This gave way to a more traditional (but still new) arrangement in season 30 (1998), and there have been several more re-arrangements in various styles since then.
* ''Series/StarTrekEnterprise'' had the widely derided theme song "Where My Heart Will Take Me", which was remixed with more of an upbeat rhythm for the third season, apparently in the hopes that this would make people somehow like it.
* ''Series/{{Survivor}}'' did this throughout the first twenty seasons with its theme "Ancient Voices." Each season's version had different vocals and elements that usually corresponded to the country where the season took place (a gong in ''Survivor China'', a didgeridoo in ''Survivor Australia'', etc.). Season twenty-one, ''Survivor Nicaragua'', averted this by returning to the first season's version.
* ''Series/ThirdRockFromTheSun'' used a 50's rock & roll-inspired theme composed by Ben Vaughn for much of its run. Occasionally, the theme would be remixed for specific episodes - for example, sleigh bells added for Christmas episodes. The big change came in season 5 when a swing version performed by Big Bad Voodoo Daddy was used, only for the original version to return for the sixth and final season.
* After Czechoslovakia split into Slovakia and the Czech Republic in 1992, the theme song to ''Series/WhereInTheWorldIsCarmenSandiego'' changed an instance of "Czechoslovakia" to "Czech and Slovakia". Later, this section of the song was re-lyriced completely.
* Some more GameShow examples:
** ''Series/FamilyFeud'' had its original Richard Dawson-era theme remixed for the Ray Combs version in 1988, adding synthesized drums and toning down the country elements. It was given a more substantial, jazzy remix for Dawson's return from 1994-95. The Louie Anderson version in 1999 got a theme that was mostly new but contained a short sample of the original melody - this theme got remixed when Richard Karn took over in 2002 (removing the elements of the classic theme), and again when John O'Hurley took over in 2006. The Combs-era theme returned briefly during part of Karn's first season, and then permanently starting with ''Celebrity Family Feud'' in summer 2008 (though some early episodes from the 2008-09 season used yet another remix of the Anderson theme).
** The familiar melody from ''Series/{{Jeopardy}}'' dates all the way back to the show's beginnings in 1964, when it was only used as the ''Final Jeopardy!'' [[JeopardyThinkingMusic thinking music]]. It was adapted as the main theme for the show's revival in 1984, with a synthesizer arrangement, while the original 1964 version continued to be used as thinking music. Bongos were added to the main theme in 1991. Then in 1997, the theme received a more fully orchestrated remake, while the think music was also reworked for the first time in more of an easy-listening style (and was given a slight remix shortly after its introduction). The main theme got a similar but faster re-arrangement in 2000, then both the main theme and think music were redone again in 2008 (and once again the think music was slightly remixed about a month in).
** The 1990-91 version ''Series/MatchGame'' used a Latin jazz-flavored remix of the 1973-82 version's theme.
** ''Series/ThePriceIsRight'' has used the same theme song melody in all of its U.S. incarnations since 1972. The same recording was used on the daytime version all the way through BobBarker's retirement in 2007, though a new jazzy version was used on the 1994 syndicated edition and some international versions. When Drew Carey took over the daytime version, a new recording was made that sounded fairly close to the original, but was more "percussive" and contained more synthesized instruments. The "come on down" music (which had previously gone through multiple iterations), Showcase Showdown win cue, and losing horns were also reworked - and more recently, some of the older prize music cues have also seen remixes.
** The 1990-91 revival of ''Series/ToTellTheTruth'' used an orchestral instrumental version of the vocal theme from the 1969-78 version.
** For its final season in 1974-75, the syndicated ''WhatsMyLine'' got a faster and funkier version of the theme used from 1968-74.
** ''Series/WheelOfFortune'' used several variations of the theme "Changing Keys" (composed by creator MervGriffin) between 1983 and 2000. The theme got a mild remix in 1984, was jazzed up in 1989, and got a slower jazz mix with more guitar in 1992. Then in 1994, the theme was more substantially reworked with a big-band arrangement - still based on the same melody, but with a different rhythm. The 1997 version was based on the 1994 one but was faster and more jazzy.
*** In 2000, a new theme was introduced, "Happy Wheels" by Steve Kaplan. This also has had several versions, one of which borrowed a short portion of the 1994-2000 arrangement of "Changing Keys".
[[/folder]]

[[folder:Music]]
* Music/TheBeatles have done this. The songs of ''Let It Be... Naked'' are mostly evolutions of songs from the original ''Let It Be.''
** "Across the Universe" has two different arrangements from the classic era -- one from ''Let It Be,'' and the one currently on ''Past Masters.''
** Music/TheBeatlesAnthology are three double albums full of unreleased footage of Beatles songs that show how these songs have evolved during recording sessions into their final iconic forms. Particularly interesting are the three versions of ''Strawberry Fields Forever'', which are neatly put behind each other in chronological order on side two of the second disc.
** "Revolution" and "Revolution #1" are another fast evolution of the same song.
* PaulMcCartney has also done this as a solo artist, both to his own works and to Beatles songs. He ''loves'' remixes...
** Paul's ''Unplugged: the Official Bootleg'' is mostly these.
** Dramatic example: "Coming Up" from ''[=McCartney=] II'' (with "The Plastic Macs") vs. the live vs. of "Coming Up" on ''Wingspan,'' vs. modern live vs. (which include ''long'' drum solos).
** Some of the songs on the GiveMyRegardsToBroadStreet soundtrack fall under this. For instance, "Ballroom Dancing" has an entire extra verse from its original "Tug of War" vs.
* The Music/ButtholeSurfers' "Some Dispute Over T-Shirt Sales" is essentially Ministry's "Jesus Built My Hotrod" (which their vocalist Gibby Haynes provided lead vocals for) with a different guitar riff: It uses the same melody and SingingSimlish lyrics.
* Music/EricClapton did this with "Layla." First he performed it with Derek & the Dominos. Then, when he did a solo unplugged performance for MTV, he did a much slower and soulful rendition of it.
* Counting Crows have changed some of the lyrics to their song "Mr Jones" -- the song was written before they had their first hit, and has lyrics about wanting to be big stars; the new lyrics are about looking back after having been big stars and realizing that it's not all it's cracked up to be. They also perform the song in a quieter and less rocking tone.
* Dennis Culp wrote a song about rhubarb pie for FiveIronFrenzy, but the band ended up using that music for some completely different lyrics that Reese Roper wrote, "Ugly Day". "Rhubarb Pie" was released later on their B-sides album.
* Every song ever performed by BobDylan.
* E from {{Eels}} seems to relish dramatically different live arrangements for older songs - for instance, the ''Daisies Of The Galaxy'' version of "I Like Birds" is laid-back and based around acoustic guitar, but at some point they started doing a much faster, noisier electric version live, and have kept playing it that way every since. During the Eels With Strings tours even songs that were originally fast paced rock or upbeat pop were played slower and more stripped down (and of course, with a string quartet).
* Several songs from Music/{{Genesis}}:
** "Watcher of the Skies" would only be performed without lyrics after PeterGabriel's departure. It would later be dropped from the setlist entirely as it only sounded good on one piece of equipment (the Mark II Mellotron it was recorded on).
** "Firth of Fifth" would have its piano intro dropped on account of it being impossible to play on contemporary digital pianos. It would later have its lyrics dropped on account of them being crap.
** PhilCollins recorded an alternate version of "Behind the Lines" on his first album, then played that version on his first solo tour.
** Several songs from Music/TheLambLiesDownOnBroadway were reworked versions of songs from their salad days that were written on the road, played live, and then dropped after a few shows.
** For the band's final two tours, most songs would be transposed into lower keys to accomodate Ray Wilson's voice and later the changes to Collins' voice.
** Many older songs, (particularly those from The Lamb, many of which didn't hold up as standalones) would be incorporated into medleys. In particular, most of their shows from 1977 on featured a medley of "In The Cage"/"Cinema Show"/other stuff (brought back for the reunion tour), and their 1992/93 tour featured an "Old Medley" of "Dance On A Volcano"/"The Lamb Lies Down On Broadway"/"Firth of Fifth"/"I Know What I Like" (dropped to just the last two on the 2007 tour).
* Music/KylieMinogue is very fond of this. Many of her live shows after her 1998 Intimate And Live Tour. She has changed her song 'I Should Be So Lucky' to both a ballad and an electronica song. She also turned her song 'I Believe In You' into a ballad and 'The Locomotion' into a jazz song.
* MarilynManson occasionally will do this with certain songs. "The Last Day on Earth" and "Coma White" have a habit of becoming acoustic ballads, and songs with female backing vocals (like "[=mOBSCENE=]") have the females replaced with Twiggy when done live. "The Dope Show" also has one instance of "cops and queers" replaced with "pigs and fags" when sung and the lyrics "The drugs, they say, are made in California", when done live, becomes "The drugs, they say, are made right here in [city name]".
* Mogwai's signature song, Mogwai Fear Satan, has changed drastically between its spot on their current live set.
* Morning Musume's "Joshi Kashimashi Monogatari" has several versions due to the song's verses being about the people in the group but the groups has a tradition of regularly adding and shedding members meaning the [[EvolvingMusic lyrics have to keep evolving]].
** "Joshi Kashimashi Monogatari" was also given a CoverVersion by HelloProject Elder Club but that also had two versions as the two tours had different members in attendance. In 2011 Dream Morning Musume formed and their first song is yet another version of JKM.
* Muse have revamped "Cave" from their 1999 debut album, ''Showbiz'', giving it a new piano arrangement when playing it live on their Resistance Tour.
* OingoBoingo also did this a lot: many of their songs were written when they were still a circus band instead of a rock band, and some of them were brought back later with rock arrangements. (Lead singer DannyElfman also re-used one of the band's old circus songs as the theme song for the Dilbert cartoon.)
* AmandaPalmer also changed all of her Dresden Dolls song arrangements and some of her lyrics after going solo.
** She changed her arrangements anyways; since she didn't know how to read sheet music, she completely played by the ear. Naturally, [[CrowningMusicofAwesome it was amazing.]]
* The PetShopBoys do this with "Being Boring" in live shows since the TurnOfTheMillennium: the lyric eulogizing friends that died of AIDS changes from "All the people I was kissing/Some are here, and some are missing in the 1990s" to the less dated "All the people I was kissing/Some are here, and some '''were''' missing '''by''' the 1990s".
* The Tiger Lillies do this a lot. Their lyrics, arrangements and stage antics are constantly changing, and it's interesting to see how much their songs evolve and grow over time.
* It happened over a relatively short period of time, but {{Weezer}}'s "Burndt Jamb" went from having SingingSimlish lyrics in one publicly released demo, to a full set of lyrics in another demo, to a completely new set of lyrics by the time it was officially released on ''Maladroit''. There's also "Private Message", which had its lyrics substantially rewritten and became "Hand To Hold" by Brian Bell's side project The Relationship, and "Thought I Knew", which conversely went from being a slow minor key Relationship song to a faster, major key Weezer song.
* FrankZappa's entire career was marked by this, something he referred to as "Conceptual Continuity." Pieces of lyrics and melody, and sometimes entire songs, would pop up in different contexts and arrangements on various albums. As an example, he released no less than three versions of "Peaches en Regalia", each sounding quite different.
* In the 80's, Neil Young re-recorded his earlier Buffalo Springfield song, "Mr. Soul," as part of his synth/vocoder-based album [[NewSoundAlbum Trans]]. This was motivated by his desire not to stagnate as an artist and his interest in recreating the experience of communicating with his cerebral palsy-afflicted son.
* TheBangles have several examples:
** When Vicki Peterson wrote "Single By Choice," it was a pretty personal song for her. After getting married to John Cowsill in 2003, she jokes about doing a "Married By Choice" version.
** Vicki's songs seem especially prone to this trope. She wrote "Lay Yourself Down" (which appears on ''Sweetheart of the Sun'') for her fiancť Bobby in 1990, as he was struggling to find his place in the music business. The song and its lyrics like those below became even more personal and poignant when Bobby began a battle with leukemia (to which he eventually succumbed in 1991):
---> ''Even if the battle is won''
---> ''The war is not over''
---> ''Itís only begun''
---> ''If thereís one still standing''
---> ''One still standing his ground''
---> ''Donít you lay yourself down''
** "Walk Like An Egyptian" has a different evolution. Debbi Peterson's drumming was replaced by a drum machine on the hit single, and in a particularly egregious case of ExecutiveMeddling, she was even left out of the vocals. Now, when the group performs the song live, Debbi's drumming still gives way to the drum machine, but she sings and plays acoustic guitar.
* {{Radiohead}} do this a lot, both intentionally and accidentally, and in a variety of ways.
** The most obvious example is that, following their dramatic shift into more experimental, electronic styles following ''Kid A'', they found a lot of their songs either very difficult or even impossible to perform live, which resulted in radically different interpretations being performed on tour. Their live album, ''I Might Be Wrong'', was released to give fans who missed out on the live shows an (official) opportunity to hear these new arrangements.
** The opposite is also true, as they often demo new songs live as they're being written. The most extreme example probably being Reckoner. Originally debuted during their 2001 tour as an aggressive (and decidedly sloppy) Grunge number, it wouldn't see an official release until 2007's In Rainbows, where it was a completely different song. During the writing process they decided they preferred an unheard bridge and scrapped all the original music and lyrics and started over. The 2001 version would later be released by Thom Yorkes solo project as Feeling Pulled Apart By Horses, though still in a radically altered style.
** Having been together as a band for quite a while now, they've also developed various ways of keeping the songs interesting for themselves. During live performances of "Everything In It's Right Place", Thom Yorke has started adding in lines from other peoples songs (often the chorus from If You Tolerate This Then Your Children Will Be Next by Manic Street Preachers). As Jonny plays a radio for several songs (notably "Climbing Up The Walls" and "The National Anthem") each performance will, naturally, be entirely different, and he usually tunes into a chat show in the countries native language. He's also been known to add in pre-recorded phrases to be manipulated live on his sampler during certain songs, often "Happy Birthday X", to mark said band members birthday.
* Music/NellyFurtado's "Say It Right" has a proper guitar solo in live performances instead of the short, repetitive riff of the studio version.
* YellowMagicOrchestra has recorded several live and studio versions of the songs from their first album, with "Behind the Mask" being played with its original lyrics and the ones MichaelJackson wrote for the song when he chose to cover it.
* Music/{{Orbital}} have done this a lot, but their track "Haclyon" has been a particularly striking example - the 1994 "+On + On" version familiar to most listeners is itself a development of the 1993 original, but soon after its release, they started incorporating a sample from Belinda Carlisle's "Heaven Is A Place On Earth" into their live performances. Some time after that, they also threw in bits of "You Give Love A Bad Name" by Bon Jovi. Since then, the track has mutated even more, its original darkness morphing into a euphoric unofficial remix of "Heaven Is A Place On Earth". It's still a highlight of their live shows, but liable to come as rather a shock to anyone who just knows the studio version.
* Dutch national treasures The Nits have made evolving music into something of a trademark, with some songs undergoing radical rearrangement for every tour. Sometimes songs are rearranged because of line-up changes, but mostly it's done just because they can.
* FiveManElectricalBand has two versions of ''I'm A Stranger Here'' and ''Signs'', though all that's really different is one line taken out in the former and the intro shortened in the latter.
* TheStatlerBrothers' "Don't Wait On Me" included the line "When the lights go on at Wrigley Field". When Wrigley got lights in 1988, the group changed the now-outdated line to "When they put a dome on Wrigley Field".
* Once MySpace fell out of favor, Music/BradPaisley changed the line "Go check out [=MySpace=] in "Online" to "Go check my {{Facebook}} page".
* SimpleMinds' song [[http://www.youtube.com/watch?v=6XtRoVofo8A "Ghostdancing"]] is obviously the final evolution of an earlier song, "http://www.youtube.com/watch?v=P-66daNl20Y I Travel." It can be traced back to during live performances of "I Travel" in 1985 when they first used the "Ghostdancing" [[EpicRiff riff]] as part of the former. They also start with the same lyrics: "Cities, buildings, falling down."
* NineInchNails often add additional parts to songs live:
** "March of the Pigs" returns to the verse riff a third time after the song would have ended on the album.
** The end of "Terrible Lie" features additional guitar and drum parts along with completely different lyrics.
** "Sin" includes elements from the remixed versions of the song. When touring for ''The Fragile,'' there was also a theremin solo at the beginning.
** When touring with DavidBowie, "Hurt" was performed as a duet between Trent Reznor and Bowie and used a drastically different arrangement.
** Starting with the tour for ''With Teeth,'' the band played a reworked version of "Closer." Instead of re-creating the album version live, the song was much shorter, featured guitars playing some of the synth parts, added a short bass solo, and threw in the drum break and keyboard riff from "The Only Time."
* BryanFerry included a reworked version of RoxyMusic 's song Casanova on the Let's Stick Together album. When Roxy Music started played the song live, they used the solo arrangement. The rearrangement turns it from quite a heavy glam rock song into a sort of lounge ballad.
* ThinLizzy wrote Suicide during the Shades Of A Blue Orphanage period and performed it live and on radio sessions.They never recorded it for an album because they felt it lacked something. Several albums later, the band had two guitarists, and came up with a new version of the song that features a galloping section and dual guitar riffs. They also amped up the hard rock elements of the song. This version appeared on the album Fighting and was very influential on the NWOBHM genre.
* Music/HankWilliamsJr rewrote his SignatureSong "A Country Boy Can Survive" twice: first in late 1999 with a [=Y2K=] theme (featuring Music/GeorgeJones and Chad Brock, the latter of whom used it as the lead single to his second album), and then again after 9/11 with a patriotic theme as "America Will Survive".
* Rodney Atkins rewrote a song called "Chasin' Girls" between the album and single release to make the lyrics more accurately reflect his relationship with his wife and children.
[[/folder]]

[[folder:Literature]]
* [[BawdySong The Hedgehog Song]] from ''Literature/{{Discworld}}'' novels. See, only the hedgehog... is immune to certain kind of abuse, but there are too much of other animals to list, so the singer usually just picks any that springs to the mind.
* The protagonist of ''[[ForgottenRealms Finder's Bane]]'' sang "The Toasting Song", where all couplets have in common only the meter and "We toast..." in the first line. HilarityEnsues when one joking couplet he made up [[spoiler:falls closer to the situation at hand than he suspected]].
* In-universe example in ''{{Holes}}'' -- the lyrics to the pig song get changed from the original Latvian when sung in English so that they still rhyme and preserve much of the original meaning.
[[/folder]]

[[folder:Theater]]
* The climactic song of ''Theatre/AvenueQ'' "For Now" used to include the line "UsefulNotes/GeorgeWBush is only for now" since he left office it has been changed... to "George Bush ''was'' only for now" or "GlennBeck is only for now" or "FoxNews is only for now".
** The London production used to have the line above, then changed it to "Gordon Brown is only for now." Now that his term as Prime Minister is over, expect another change soon.
** Various regional performances will have different changes to that line.
** Depending on what production, Christmas Eve might say "Chinese Restaurant" instead of "Korean Deli" during "It Sucks To Be Me."
** More recent productions tend to change 'Mix Tape' to say 'Mix CD' or 'CD' as often as possible given the change in syllables or meaning.
* ''{{Spamalot}}'' changed the lyrics of ''A Divas Lament'' - in which the female lead mentions not having won any awards - after the show did quite well at the Tony awards.
* "As someday it may happen / I've Got a Little List", High Executioner Ko-Ko's song from Gilbert & Sullivan's ''The Mikado'', is basically a humourous list of "undesirables" that can be updated with more current references for contemporary audiences.
** "My object all sublime", sung by the Mikado in the same show, is also sometimes altered for the same reason.
[[/folder]]

[[folder:Video Games]]
* The ''GranTurismo'' series has this opening theme, Castle Over the Moon, which becomes more and more awesome as the series progress.
* In ''VideoGame/EarthBound'', the first minute or so of the final boss theme sounds like something from the 8-bit era, then suddenly shifts to actual instruments and sounds [[https://www.youtube.com/watch?v=n3nYwTSkr0Q much more sinister]].
* In ''VideoGame/ResidentEvil3Nemesis'', the theme of the titular Nemesis changes drastically throughout the game at three specific points. Compare [[https://www.youtube.com/watch?v=B2T8RRNWY4Y his first appearance]] with the [[https://www.youtube.com/watch?v=PGCihUsoVsI Clock Tower battle]] and [[https://www.youtube.com/watch?v=ahDgPeTRCgk the Dead Factory battle]]. In fact, his theme changes ''very'' slightly with each and every set appearance he makes, but the change is so subtle it's hard to notice.
* The Comet Observatory and Starship Mario themes from ''VideoGame/SuperMarioGalaxy'' and ''VideoGame/SuperMarioGalaxy2'', which both gain more instruments as the game progresses.
** ''YoshisIsland'' did a similar thing with the map theme.
** Also, those games' takes on "Road to Bowser" from ''VideoGame/SuperMario64'', with more smoother music for ''Galaxy'' and a choir for ''Galaxy 2''.
** In ''SuperMarioWorld,'' ''SuperMarioGalaxy2,'' and ''NewSuperMarioBrosWii'' and ''[[NewSuperMarioBrosU U]]'', the background music adds more percussion when you're riding Yoshi.
** In ''MarioKart7,'' being in first place and at full speed adds extra instruments to the track - [[HardModePerks but only on 150cc.]]
* When "[[http://music.flashygoodness.com/track/luna-ascension Luna Ascension]]" from ''TowerOfHeaven'' was reused in ''VideoGame/SuperSmashLand'', it was [[http://music.flashygoodness.com/track/tower-of-heaven-luna-ascension-gb-mix redone]] to have a more authentic GameBoy sound, as well as the addition of a remix of "[[http://music.flashygoodness.com/track/pillars-of-creation Pillars of Creation]]" after the second loop.
* In ''[[VideoGame/SonicRushSeries Sonic Rush Adventure]]'', the Windmill Village music is remixed each time you craft a new vehicle, becoming faster-paced and gaining more instrument lines.
** Several games that use the the boost (which coincidentally debuted in the above series) have their music change depending on whether Sonic is boosting or not.
* In ''{{Ristar}}'', the first stage of [[BandLand Planet Sonata]] has some fun with this. You have to wake up giant sleeping birds who sing to rebuild the background music.
* ''Franchise/TheLegendOfZelda'' remixes a ''lot'' of music but they are the most egregious with the Hyrule Field theme that has been remixed and muscled into pretty much every game they've ever made. In fact, the only two games that don't have it are [[Videogame/ZeldaIITheAdventureOfLink Zelda II]] for Nintendo and, oddly enough, [[Videogame/TheLegendOfZeldaOcarinaOfTime Ocarina of Time]].
** It's done so much that the meaning of the song itself seems to have changed over time. What was once just the overworld theme (and quite the EarWorm) is now seen as more of a theme for the many Links and their acts of heroism.
* The song played during the good ending of ''VideoGame/LiveALive'' changes instruments without changing the actual tune to reflect the character being shown in the end credits. The song is played on resonator guitars when Sunset is shown, and shifts to a techno beat when Cube is shown, etc.
* ''Franchise/TheElderScrolls'' series has done this with its RecurringRiff starting from the third game. The title theme for ''[[VideoGame/TheElderScrollsIIIMorrowind Morrowind]]'', "Nerevar Rising," was given a brassy Romanesque remix for ''[[VideoGame/TheElderScrollsIVOblivion Oblivion]]''[='s=] title, "Reign of the Septims," which in turn was revived with a barbarian chorus for ''[[VideoGame/TheElderScrollsVSkyrim Skyrim]]''[='s=] "Dragonborn." Apparently the last couple centuries of world history was building up to the return of the Dovahkiin.
* ''VideoGame/PhantasyStarIII'''s overworld music gains more instrumentation as you recruit more party members.
* A ''very'' early game to make use of this is the little known ''Slamscape''. The music in levels would stay the same but the instruments would change depending on what enemies were near. It served as a handy means of knowing if certain enemies were sneaking up on you and, [[NintendoHard given the game's difficulty]], it was definitely appreciated. Certain powerups would also add additional riffs to the song, like an extra drum line.
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[[folder:Western Animation]]
* ''WesternAnimation/AlvinAndTheChipmunks'' introduced a [[AutobotsRockOut harder rocking]] version of the theme in season 6. On NBC, the episodes produced by Murakami-Wolf-Swenson (MWS) used this version with a montage of clips from TheMovie, while syndication prints of these episodes dubbed it over the original opening. The [[DiCEntertainment DiC]]-produced episodes played this theme over a newly animated sequence, though at least one of these episodes used the movie montage.
* During the first season of ''MuppetBabies'', the closing credits featured a version of the opening theme with just the {{scatting}} background vocals. Early in the next season, ''Muppet Babies'' was followed by ''Little Muppet Monsters''; the whole hour used a hybrid of the two shows' themes as an opening, and the instrumental of this was used for the combined closing credits. After ''Monsters'' met its quick demise, the closing for the ''Muppets, Babies, and Monsters'' hour replaced the original ''Muppet Babies'' closing theme for the rest of its run.
* For Season 2, ''WesternAnimation/TheSimpsons'' had Danny Elfman do a new arrangement of the opening theme to go with the redone animation. Then in season 3, the animation was left unchanged, but music director Alf Clausen re-arranged both the opening and closing themes. Clausen's season 3 versions have remained in use ever since, even after the opening was re-animated again for the show's transition to HD.
* In addition to changing the visuals of the theme song every season, ''WesternAnimation/SouthPark'' has also switched between several different remixes of its main theme.
[[/folder]]
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