A self-explanatory trope: a show completely replaces its ThemeTune at some point within its run. There are several likely reasons: music licensing issues, an overall change in tone that would make the original theme SoundtrackDissonance, or just a way of freshening things up if the show is a LongRunner.

Compare RearrangeTheSong. Related to CreditsJukebox.



* This is normal for modern anime. Two-cour series will typically get a new OP and/or ED somewhere around episode 13. LongRunners will switch them less frequently. {{Oddly named sequel|2ElectricBoogaloo}}s will ''always'' have new themes.
* ''Manga/DeathNote'' had two themes. The first theme was ''[[http://www.youtube.com/watch?v=g2VyTSiEygI The World]]'', and the second was ''[[http://www.youtube.com/watch?v=3bvk3V_yPh4&feature=related What's Up, People?!]]''.
* Taken to extremes in the second cour of ''Anime/MawaruPenguindrum'' where a different end theme was used in almost every episode.
* ''Anime/SailorMoon'' had "[[https://www.youtube.com/watch?v=QMtLwp62ZSA Moonlight Densetsu]]" as its theme song for the first four seasons before changing it to "[[https://www.youtube.com/watch?v=UlkN58iORYE Sailor Star Song]]" for the fifth and final season.
* ''Anime/{{Pokemon}}'' changes its theme every season for both the English and Japanese dubs. Both regions have reused their respective original theme at least once however.
* ''Anime/YuGiOh'' does this with the Japanese version, but the English dub by [[Creator/FourKidsEntertainment 4Kids]] has two variations of the same theme.
** The English dubs of each subsequent series (''[[Anime/YuGiOhGX GX]]'', ''[[Anime/YuGiOh5Ds 5Ds]]'', and ''[[Anime/YuGiOhZexal ZEXAL]]'') introduce one new theme song per series, but the same theme is retained throughout a series' run.
* Averted with ''Anime/TokyoMewMew''.
* Over the course of its two-season run, ''Anime/CodeGeass'' changed the opening theme ''five times''.
* ''Anime/LupinIII'' shifted the opening of each of its series from time to time, and the movies change it up as well. Anime/LupinIIIRedJacket used four distinctly different versions of the famous Lupin theme throughout its three-year run.
* ''Gatchaman'' interestingly replaced its opening theme, with the ending theme (and vice versa) around episode 20. The "new" opening is much better known than the original (which had a children's chorus in a fairly hard-boiled spies and superheroes show).
** There are a few anime that switched the opening theme song with the closing song (and vice versa). It happened with ''Anime/HakushonDaimao'', ''Hazedon'', ''Manga/KiteretsuDaihyakka'' and ''Manga/ChibiMarukoChan''.
* ''Manga/DragonBall'' and ''Anime/DragonBallGT'' had one theme tune each, while ''Anime/DragonBallZ'' and ''Anime/DragonBallSuper'' switched to a new song when beginning their final arcs.
* Oddly subverted for anime based on Creator/YoshihiroTogashi's works. Both ''Manga/YuYuHakusho'' and the 2011 version of ''Manga/HunterxHunter'' [=OPs=] stayed the same ("Smile Bomb" and "Departure" respectfully) with only the visuals really changing to reflect the current story arc. Played straight with the [=EDs=] which used different songs.
** The 1999 version of ''Hunter x Hunter'' likewise played the trope straight.
* The ''[[Anime/PrettyRhythmAuroraDream Pretty]] [[Anime/PrettyRhythmRainbowLive Rhythm]]'' [[VideoGame/PriPara anime franchise]] tends to do this every thirteen episodes to both the opening and ending theme.
* ''[[Franchise/HelloKitty Hello Kitty's Paradise]]'' used two different openings. The first one, ''[[https://www.youtube.com/watch?v=TLKQn2klzZM Kitty's Paradise]]'', appeared on the television broadcast, while home video releases of the show used the insert song ''[[https://www.youtube.com/watch?v=U4RuaI2hFyg In A Balloon]]'' as the opening theme.
** The English dub also does this. The broadcast version uses [[https://www.youtube.com/watch?v=bIWVKbOOvvY an original song]] sung by the actress who plays Mimi, while the home video version uses [[https://www.youtube.com/watch?v=DTU2VpTJ0So a theme inspired by]] the first Japanese theme, which is also sung by a street band at ''Ride/UniversalStudios Florida''.
* To promote their then-upcoming dub of ''Anime/DigimonDataSquad'', Disney decided to dub the remaining Digimon movies that had stayed in Japan. When it came to dubbing [[Recap/DigimonAdventure02M2DiablomonsCounterattack the 02 movie]] and both ''[[Recap/DigimonTamersM1BattleOfAdventurers Tamers]]'' [[Recap/DigimonTamersM2TheRunawayDigimonExpress movies]], however, they didn't have the rights to "Digimon are the Champions" as their themes. Instead, they had to use the ''Anime/DigimonFrontier'' theme (and associated score, for that matter) across all [[Recap/DigimonFrontierMovieRevivalOfTheAncientDigimon four]] movies.
** When ''Anime/DigimonAdventureTri'' was dubbed into English by Toei and Eleven Arts rather than Saban, rights issues led to the lack of the original English theme song again. This time, [[Main/SuspiciouslySimilarSong a new song with a similar feel to the original]] called "Digimon are Back Again" was recorded and used.

[[folder:Live Action TV]]
* ''Series/TheBill'' used several different variations of the original 1984 theme tune, [[RearrangeTheSong often rearranged to keep up with modern trends]], until the series' last season in 2009/2010 whereupon during the show's final retool it got brand new opening and closing themes.
* ''Series/WheelOfFortune'' used an Alan Thicke tune called "Big Wheels" until 1983, when it was ousted for "[[http://www.youtube.com/watch?v=wf37Dgj92QM Changing Keys]]", composed by show creator Creator/MervGriffin. "Changing Keys" was re-orchestrated several times (with Merv having little to no hand in the last two remixes) until the theme was finally retired in 2000 for an unnamed theme by Steve Kaplan. And ''that'' theme was retired in 2006 for the current tune, "Happy Wheels" by Frankie Blue and John Hoke.
* ''Series/TheJokersWild'' started out with Jean-Jacques Perrey and Gershon Kingsley's synth theme "The Savers". Over time, the show changed themes like crazy: a SuspiciouslySimilarSong version composed by Alan Thicke titled "Joker's Jive", a re-orchestration of "The Savers" by Hal Hidey, a new theme composed by Hidey (which was always the closing theme), and even another Perry and Kingsley song for a very short time. What's more, Barry and Enright also stole the [[http://www.youtube.com/watch?v=0zxG6zloL6w theme]] from ''Series/{{Break the Bank|1976}}'' for a tournament of champions.
* ''Series/{{Lingo}}'' used a short, looped "game show"-y music in seasons 1 and 2 (actually a remix of the [[http://www.youtube.com/watch?v=NA6t-URfPDY Dutch version's theme]]), and a completely different [[http://www.youtube.com/watch?v=BKIz_WAEnf0&feature=related rock theme]] from Season 3 onward.
** The complete opposite could be said for the Dutch version. There the "game show"-y tune replaced a rock theme.
* ''Series/TheDrewCareyShow''. Drew's cover of Robert [=McGuire's=] "Moon over Parma", "Five O'Clock World" by the Vogues and "Cleveland Rocks" by the Presidents of the United States of America.
* ''Series/TheUnit''. First "Fired Up", then a different tune by the same guy (perhaps because "Fired Up" was adapted from a Marine Corps cadence and therefore not a good choice for an Army-based show).
* In season 4, ''Series/BigLove'' changed from "God Only Knows" by Music/TheBeachBoys to "Home" by Engineers.
* Each season of the ''Series/SClub7'' TV series had a different song as its opening theme. ''Miami 7'' had "Bring It All Back", ''LA 7'' had "Reach", ''Hollywood 7'' had "You" and ''Viva S Club'' had "Alive".
* The original ''Series/{{V 1983}}'' changed its theme tune a number of times during its run.
* ''Series/AufWiedersehenPet'' deliberately changed its opening and closing themes for each new series or special.
* ''Series/{{Space 1999}}'' got a new composer as part of a general makeover when Fred Frieberger took over as producer in season two.
* ''Series/TheAvengers'' originally had a theme tune by Johnny Dankworth. It also underwent a complete makeover when production was switched from videotape to film, simultaneous with Diana Rigg's arrival, resulting in the more familiar Laurie Johnson theme.
* The change of ''Series/{{Monk}}'''s theme tune is notable as it was implicitly referenced in-show, at a BreakingTheFourthWall moment.
* ''Series/BabylonFive'' made a point of doing this every season, to reflect the changing theme of the show.
* ''Series/HappyDays'' used a specially recorded version of "Rock Around the Clock" by Music/BillHaleyAndHisComets as its theme tune in its first season, then changed over to a DaysOfTheWeekSong specially written for the show. (This was a case of promoting from within, as the song had been featured over the closing credits in the first season.)
* ''Series/ThePartridgeFamily'': went from "When We're Singing" in season 1 to a similar-sounding but different song, "C'mon, Get Happy".
* ''Series/{{Chuck}}'' went through several incarnations before settling on "Short Skirt Long Jacket".
* ''Series/WhiteCollar'' had a new theme for season 3. Which they changed back to the old theme a few episodes in.
* ''Series/{{Farscape}}'' changed its theme tune between seasons 2 and 3.
* During its run on Creator/{{ABC}}, ''Series/{{Password}}'' changed its set and theme tune for the transition to ''Password All-Stars''. Robert Israel's synthesized theme "For The Fun Of It" was replaced by Bob Cobert's "Bicentennial Funk".
** On CBS, ''Series/{{Password}}'' had "Holiday Jaunt" as its first theme. In 1963, it was replaced with Bob Cobert's "You Know The Password."
* ''Series/MagnumPI'' had a different theme song for its first year, before switching to the more familar Mike Post/Pete Carpenter tune for the second season premiere. (Nowadays the Post/Carpenter theme has been affixed to season one episodes as well.)
* ''Series/OnlyFoolsAndHorses'' started with [[http://www.youtube.com/watch?v=6gmM8k1XzyM this]] for its first series and Christmas special. Most repeats and DVD releases of the first series nowadays replace it with the more familiar opening theme introduced in series two, though the 1981 Christmas special still opens with the original tune when repeated on GOLD.
* ''Series/SimonAndSimon'' went from a bouncy theme with lyrics from the first season to a more traditionally 80s detective series theme for the rest of the run.
* ''Series/HardcastleAndMcCormick'' started out with the hard pounding theme "Drive". For part of the second season, this was changed to the theme "Back to Back" which emphasized the friendship of the two title characters. "Drive" returned in Season 3.
* ''Series/RemingtonSteele'''s first season featured the tune "Laura's Theme" as Stephanie Zimbalist explained the series premise. The second season introduced a theme based on a small bit of incidental music that played as Remington would say something like "God I'm good!" after Laura explained how the case was solved.
* Licencing issues forced the removal of the cover version of "My Life" from ''Series/BosomBuddies'' reruns, while certain public domain episodes of ''Series/TheBeverlyHillbillies'', ''{{Series/Bonanza}}'', ''Series/TheDickVanDykeShow'' and ''Series/TheAndyGriffithShow'' air on smaller stations without their famous themes.
* ''Series/BoyMeetsWorld'' had a different InstrumentalThemeTune each season for seasons 1-4. Season 5 introduced a TitleThemeTune that stayed through to the end.
* ''The Nightly Business Report'' has had four different theme tunes in its 30+ years on air, all were produced by Edd Kalehoff.
* ''Series/RedDwarf'' switched from a ''Film/TwoThousandOneASpaceOdyssey''-style opening theme to an instrumental based off the end credits theme in the third season, as the original theme was too sombre for a sci-fi sitcom. When those seasons were digitally remastered, they had a new opening theme that combined both themes.
* The 1998-2004 version of ''Series/TheHollywoodSquares'' used its own song "I Love Hollywood," sung by none other than Whoopi Goldberg, from 1998-2002. Afterward, it switched to "Hollywood Square Biz," Teena Marie's 1981 single [[RealSongThemeTune "Square Biz"]] with new lyrics.
* In the first few episodes of ''Series/FamilyMatters'', the theme song was Louis Armstrong's "What A Wonderful World". It was quickly dropped in place for an original theme, "As Days Go By".
* ''Series/StarskyAndHutch'' initially had a [[http://www.youtube.com/watch?v=d37n5mYx0yA theme by Lalo Schifrin]] edited from his climax cue for the pilot (link includes the pilot end credits); this was subsequently replaced for season two by [[http://www.youtube.com/watch?v=gsJ4pALlbEM the most famous one by Tom Scott]], which in turn was replaced in the third season by [[http://www.youtube.com/watch?v=E-i2XeVUnB8 a theme by Mark Snow]], which got replaced itself in the final season by [[http://www.youtube.com/watch?v=tYHddH_0p4s Scott's theme in another arrangement]].
* ''Series/ProjectUFO'' used a military-sounding march as the basis for its first season theme song, but switched to a more generic tune that might have fit any number of '70s action-adventure shows. Which was probably intentional, as the second season opening as a whole gives off a (somewhat misleading, as the show was really more of a "military procedural") science-fiction action-adventure vibe.
* ''Series/TokumeiSentaiGobusters'' changed its theme tune in the 28th episode as part of a ReTool. No previous ''Franchise/SuperSentai'' had previously done this, although ''Series/GekisouSentaiCarranger'' did RearrangeTheSong.
* Two series deserve mention for averting this trope not over the course of three or four years, but going on half a century: the British series ''Series/CoronationStreet'' (debuted 1960) and ''Series/DoctorWho'' (debuted 1963) have introduced new arrangements of their original themes from time to time, but have never replaced them with new compositions.
* The original version of ''Series/ThePriceIsRight'' (1956-65) first had "Sixth Finger Tune" (from a show called ''Six Fingers For A Five-Fingered Glove'') as its theme. In 1961, it was replaced with Bob Cobert's "Window Shopping." In turn, "Window Shopping" was the first theme to the 1967 Goodson-Todman game ''Snap Judgment.'' A year later, it was replaced with an original Score Productions theme.
* ''Series/ToTellTheTruth'' had three themes during its original CBS run. From 1956 to 1962 it used "Peter Pan" (also known as "Nothing But The Truth"), followed by Bob Cobert's theme to 1967, and a Score Productions arrangement to its 1968 finale.
* The original NBC edition of ''Series/MatchGame'' (1962-69) used Bert Kaempfert's [[RealSongThemeTune "A Swingin' Safari"]] as its theme up until 1968 when it was replaced with a Score Productions theme.
* The 1966 NBC game show ''Series/EyeGuess'' had Al Hirt's [[RealSongThemeTune "Sugar Lips"]] as its theme up until 1968, when it was replaced with a Bob Cobert piece. Cobert's composition would be reused in 1971 on ''Series/ThreeOnAMatch''.
* The first, black-and-white season of ''Series/IDreamOfJeannie'' (1965-1966) used a jazz piece by Richard Wess that only a few can recognize. When it switched to color, Hugo Montenegro's more familiar jazz-pop theme replaced it.
* For the third and final season of ''Series/LostInSpace'', its original theme was replaced, along with the visual design, with a livelier, more memorable theme by the same composer, Johnny Williams (later known as superstar film composer Music/JohnWilliams). And in fact it was almost replaced in season two by a piece by Warren Barker, but the Barker track was never heard on the show.
** Creator/IrwinAllen had a serious case of ReplacedTheThemeTune through the 1960s;
*** Music/JerryGoldsmith scored the season two premiere of ''Series/VoyageToTheBottomOfTheSea'' and wrote a new theme that was only heard on that episode (the usual Paul Sawtell theme returned the following week and was never replaced again).
*** ''Series/LandOfTheGiants'' had a different Johnny Williams theme for each of its two seasons (meaning it had four themes, as the first Williams theme replaced two thrown-out efforts by Alexander Courage and [Joseph] Mullendore).
*** Averted with ''Series/TheTimeTunnel'', probably because it only lasted for one season.
** Going back to Williams, ''Series/KraftSuspenseTheatre'' was another series where he composed both themes.
* The sci-fi/fantasy show ''Series/{{Sanctuary}}'' changed its theme from [[https://www.youtube.com/watch?v=9qTeF2VtHn4 this]] (composed by Joel Goldsmith, who co-scored the series' first season) to [[https://www.youtube.com/watch?v=4dI8_5DVnlk this]] (composed by Andrew Lockington, who scored the series after Season 2) in its third season, citing SoundtrackDissonance. Unfortunately, they never changed the opening sequence to match the new theme tune, but it was eventually trimmed down quite a bit anyway.
* ''Series/LazyTown'' staring with the season after the end of "[=LazyTown=]: Bill Thompson" & in syndication replaces its theme with an insturmental sports style theme tune for both opening credits & closing credits. This is also with the syndication genre shift from educational musical show to educational action show plus a small music budget.
* The normal theme song for ''Series/SonsOfAnarchy'' was replaced by a more Celtic-flavored version in the third season during the run of episodes in which the Sons visit North Ireland.
* In Series/{{Philadelphia}}, {{Creator/ABC}} station WPVI-6's "Move Closer to Your World" is the station's legendary news theme; which has remained a part of ''Channel 6 Action News'' since 1972. An attempt at a grand recomposition, using the London Symphony Orchestra, in 1996 was universally panned, and after four days of viewer complaints, the old cut was reinstated, and that version with an occasional freshening has remained ever since.
* ''Series/UltramanLeo'' had a theme song by the same name for the first 13 episodes, then switched to "Ultraman Leo Fight!" for the rest of the show. The original theme often popped up as a ThemeMusicPowerUp instrumental and a snippet was used on [[OnTheNext episode previews]].
* Something similar happened in ''Series/UltramanEighty'', only much later in the series run.
* Most American daytime soap operas that fall under the {{Long Runner|s}} banner embody this trope. A notable example would be ''Series/GuidingLight'', the longest-running of all American daytime soaps. Over its 57 years on television, it used 11 different themes, several of which were {{rearrange|TheSong}}d. Musical styles included organ, orchestra, disco, pop, rock, and R&B.
* ''Series/TheTwilightZone'' originally had a dreamy theme by Music/BernardHerrmann - the one everybody knows didn't come along until season two, when CBS decided it needed something more upbeat. Herrmann wrote two alternative themes which weren't used, and Music/JerryGoldsmith wrote one which was also turned down; CBS music head Lud Gluskin then put together two short tracks written by Marius Constant, and the rest is history (ironically, Constant was never credited with the theme on the show).
* Even ''Series/{{Bonanza}}'' fell victim to this; creator/executive producer David Dortort, no fan of the classic Livingston/Evans theme song, had his composer of choice David Rose write a new theme that debuted in the 1970-71 season (the Livingston/Evans theme returned for the final season).
* British school series ''Series/GrangeHill'' replaced its original, bouncy, circus-style theme with something that sounded like a speeded up version of ''Series/CagneyAndLacey'''s theme tune. As the show did tend to aim for gritty realism rather than comedy, the new one was more suited but the original is the one that everyone remembers.
* ''Newton's Apple'' switched from Music/{{Kraftwerk}}'s "Ruckzuck" to an original theme tune in 1994.
* For the fifth season of ''Series/ThirdRockFromTheSun'' the theme changed from the 1950's inspired rock tune, to a big band cover version. It only lasted for that season. Interestingly, the DVD menus feature the original theme song.
* For the first season of ''Series/TheOuterLimits1963'', Dominic Frontiere (who was a production executive as well as a composer) created a magnificent orchestral theme. When Frontiere joined much of the production staff in quitting between seasons due to ExecutiveMeddling, his replacement was Harry Lubin, whose {{Theremin}}-dominated theme was used during the second season.
* ''Series/TheRebel'' originally had an ExpositoryThemeTune by Music/JohnnyCash. The syndicated reruns replaced this with a generic Western instrumental, presumably to avoid paying Cash royalties.
* ''Series/GimmeABreak'' combined this with RearrangeTheSong for Season 3; with the original theme giving way to a slightly rewritten version that was heavy on the synthesizers.
* ''Series/TheLeftovers'' replaced the instrumental Max Richter opening theme used in season 1 with Iris [=DeMent=]'s "Let The Mystery Be" in season 2, with a completely different title sequence to go along with it.
* ''Series/NightGallery'' had one theme for the pilot movie, another theme for the first two seasons and one last theme used for the third season.
* For the first three seasons, ''Series/TheDeadZone'' used the moody and evocative "New Year's Prayer" by JeffBuckley. At the top of season 4 this was replaced with "Dead Zone Epic" by Blues Saraceno, to the annoyance of many fans. The visuals, originally created for and timed to the Buckley version, remained unchanged, making the new tune feel like a poor fit--at least until you got used to it. The new tune was in place for two seasons; Season 6 had TitleCard credits.

[[folder:Professional Wrestling]]
* Both ''Wrestling/WWERaw'' and ''Wrestling/WWESmackdown'' have changed their {{Real Song Theme Tune}}s several times over the years.
** Don't forget about the actual wrestlers themselves. This happens all the time due to forming new teams/factions, face/heel turns, etc. As a result it's harder to name someone that DIDN'T change their theme music than it is to name someone that has.

[[folder:Video Games]]
* The ''Franchise/{{Halo}}'' series first used a new main theme for ''VideoGame/HaloReach'' before coming up with another new one for the games from ''VideoGame/{{Halo 4}}'' onward, although the original theme still occasionally appears.
* ''VideoGame/SyphonFilter: Logan's Shadow'' changed its main theme, but the original theme still appears as a SofterAndSlowerCover.
* The ''VideoGame/TimeCrisis'' series replaced its theme for the third installment, then heavily reworked that theme for the fourth. However, Wild Dog's theme, which contains a variation of the original theme, still appears in both installments.

[[folder:Web Original]]
* ''WebAnimation/NextGPoop'' originally used the song "[[Series/{{Friends}} I'll Be There for You]]" by The Rembrandts as a theme song for episodes made since mid-season 1. However, in 2009, Matt realized that [=YouTube=] was starting to mute any episode that used that song, and so he [[ClumsyCopyrightCensorship rather clumsily]] changed the theme song for late-season 3 onward to "Take Me Away" by the Plain White T's. Finally, a J-pop theme was used during season 4.

[[folder:Western Animation]]
* ''WesternAnimation/GarfieldAndFriends'' used three theme songs throughout its run "[[http://www.youtube.com/watch?v=NMELnad_HRE Friends Are There]]" for Seasons 1-2, "[[http://www.youtube.com/watch?v=-N_j18piqkU We're Ready to Party]]" for Seasons 3-6, and the [[http://www.youtube.com/watch?v=c6vL48DHcKw rap-sounding theme]] for Season 7 (but only in the US). In an interesting variation, "Friends Are There" was sometimes used as a {{Leitmotif}} even after its retirement.
* ''WesternAnimation/StaticShock'' went through three different theme songs. The first two themes switched back and fourth at times, but the third theme had always played after its debut.
* A lot of people may have forgotten (unless they bought the [=DVDs=]), but ''WesternAnimation/TheFlintstones'' originally had a different title sequence with an instrumental theme tune. The first two seasons of ''The Flintstones'' featured an instrumental entitled "Rise and Shine" (which was also frequently used as incidental music) in its opening. Later, another piece of incidental music had vocals added, was titled "Meet the Flintstones," and was used to open the remainder of the original series. The closing credits changed later in the series to replace "Meet the Flintstones" with a reprise of Pebbles and Bamm-Bamm singing "Let the Sunshine In" from one of the episodes. Trope averted in the syndicated version of the series available from the 1970s to the 1990s, when opening and closing credits were standardized and all episodes featured "Meet the Flintstones".
* ''Franchise/ScoobyDoo'': The later seasons did away with its iconic "Where Are You?" theme song in its entirety. Many fans assert that this change coincided with an overall drop in the show's quality as it preceeded the introduction of [[TheScrappy The Original Scrappy]] by one season.
** The first few episodes of the original cartoon featured an instrumental piece before the "Where Are You?" theme took over for the rest of its run.
* ''WesternAnimation/JohnnyTest'' has had a different theme since its second season.
* The ''WesternAnimation/SkyDancers'' cartoon had a different opening and entirely new background music when it was released in volumes on DVD.
* ''WesternAnimation/CaptainNTheGameMaster'': The first season had some pretty awful opening music, though it ended with the infamous "Captain N! The Game Master!" During Season 2, the show was given more memorable/catchy theme music, and the "Captain N..." line was dropped. Season 3, meanwhile, used a shortened and slightly sped-up version of the Season 2 theme.
* ''WesternAnimation/TeenageMutantNinjaTurtles1987'' received a brand new theme song for the DarkerAndEdgier "Red Sky Seasons".
* ''WesternAnimation/RockosModernLife'' switched to its better known theme song after the first season.
* When ''WesternAnimation/KingLeonardoAndHisShortSubjects'' went into syndication as ''The King And Odie Show'' in 1963, the opening title and theme was replaced by a much shorter edition. This was because it was packaged as both a 15-minute and 30-minute weekday strip. In the 1980s, the series with the original NBC-aired titles and theme was syndicated.
* The first theme for ''WesternAnimation/BatmanTheAnimatedSeries'' was a variation of the Creator/DannyElfman theme from the Creator/TimBurton ''Film/{{Batman}}'' [[Film/BatmanReturns films]]. When the show was rebranded ''The Adventures of Batman and Robin'' to feature Robin more prominently, a new theme by Shirley Walker was composed.
* The theme tune to ''WesternAnimation/ThomasTheTankEngine'' was replaced with the "Engine Roll Call" after original composers Mike Donnell and Junior Campbell left the series. Interestingly however, the show has taken to inserting the original tune in cameo form as of recently.
* ''WesternAnimation/SWATKats'' had different themes for each season, both by the same composers.
* In a variation, ''WesternAnimation/AdventuresOfTheGalaxyRangers'' changed the song used on the closing credits about halfway through the series' run.
* ''WesternAnimation/SamuraiJack'' starts with an OpeningNarration and transitions into a light-hearted rap by Will.I.Am for its first four seasons. The [[WesternAnimation/SamuraiJack2017 fifth season]] debuted 12 years later, and has an all-new OpeningNarration that over takes the entire introduction sequence, representing the DarkerAndEdgier tone. The rap still plays over the end credits, however.
* ''[[WesternAnimation/TheBugsBunnyRoadRunnerShow The Bugs Bunny/Road Runner Show]]'': For its final season (1984-85), the "This Is It" theme replaced by a new theme song, "It's Cartoon Gold".
** For its first two seasons, ''The Bugs Bunny & Tweety Show'' used a montage of clips with narration over them. Four episodes into its third season, the familiar "This Is It" theme returned.
* Downplayed for ''TheNewAdventuresOfWinnieThePooh''. The same theme was used throughout the series, however later episodes rerecorded it with a slightly different instrumentation. Also while earlier episodes used a short orchestral variant for the ending credits, later episodes used an instrumental version of the full opening theme. Played straight with the ''Growing Up with Pooh''[=/=]''The Magical World of Winnie the Pooh'' DVD releases of the series however.[[/folder]]