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"Mine's a tale that can't be told, my freedom I hold dear How years ago, in days of old, when magic filled the air T'was in the darkest depths of Mordor, I met a girl so fair But Gollum, and the Evil One, crept up and slipped away with her"
So you're a big fan of fantasy. You've read all of J. R. R. Tolkien's works and you play Dungeons & Dragons on a regular basis. However, you also want to be a musician and find Filk and other such genres way too mellow for you. So, what does one do? Join the exciting field of fantasy-based Heavy Metal! Yes, metal is not just about Satan. Sometimes it's about Sauron.
Your band can put out a couple songs with lyrics all about ancient prophecies and epic quests, and everyone will be too busy rocking to your awesome guitar solos and killer drumbeats to care.
Power Metal is probably the most common genre for this type, but there are others, like Viking Metal, Gothic Metal, Folk Metal, Black Metal and Symphonic Metal (which is why you can be skilled in instruments other than the typical rock ones). However, not all power metal bands fall under this trope (especially many American power metal bands) as the subgenre is also known for its similarities to speed metal and the New Wave Of British Heavy Metal.
The whole thing was kicked off by guys like Led Zeppelin, Jethro Tull, and Rainbow, with the occasional support from Black Sabbath, so the whole genre is decidedly Older Than They Think.
Some Christian Rock falls into this.
Named after the fictional metal Mithril from J. R. R. Tolkien's Middle-earthnote and yes, we know incredible lightness is one of the salient features of Mithril.
Note: This covers music based on science-fiction as well as fantasy. Compare Filk Song, which mix the Sci-Fi, Fantasy and general geekdom with folk-style ballads. Many are Concept Albums. Also note that, despite the title, this music doesn't have to be metal - or even rock - to qualify. It just has to be fantasy-based.
Comics Rule Everything Around Me is the Rap counterpart. See also Elvish Presley.
Compare and contrast Cyber Punk Is Techno for the music common for science fiction.
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Miscellaneous (please help sort them into subgenres)
Radio Rivendell is an internet radio station focusing on Heavy Mithril and video game music.
There are many bands based on Harry Potter, called Wizard Rock (Wrock for short).
And now there's Time Lord Rock (Trock for short), as well. In particular, Doctorin' the TARDIS, a mash-up by The KLF, which reached #1 in the UK in 1988.
Uriah Heep paid tribute to The Doctor back in 1972 with "Traveller in Time".
Chameleon Circuit loves this genre. In particular, 'Exterminate, Regenerate' and 'Blink.’
Chameleon Circuit is this genre. Not only are all of their songs (and their band name) centered around Doctor Who, but they are pretty much responsible for Trock resurfacing on the internet in its modern form; they did not invent it, contrary to popular belief.
There is an album of "Lord of the Rings" metal/rock by a Polish band called Drużyna Trzeźwych Hobbitów (The Fellowship of Sober Hobbits).
Stemage. A Metal band that bases almost all their songs on Metroid or just straight up does covers of the series soundtrack- very metal covers.
This trope has been noticed, and lovingly parodied, by Tripod. As Yon says, "We find them [Wolfmother] very encouraging. Because if you listen to the lyrics of that kind of music, you find that it's possible to be rock... yet, at the same time, be a massive Dungeons & Dragons enthusiast."
Quite a few bands write HP Lovecraft-themed songs, some occasionally (Nile, Metallica, Dark Moor) and some often (The Darkest of the Hillside Thickets).
There's even a death metal band from France CALLED Lovecraaft who write almost entirely HP Lovecraft songs.
And a band from the 60's that played rather odd progressive rock.
Casey Rae-Hunter, alias The Contrarian, has even released an entire concept album revolving around HP Lovecraft's Cthulhu mythos. For the most part, it's pretty heavy (maybe not specifically metal, as it markets itself as "haunt-rock").
Hedningarna - Drafur Och Gildur
The relatively obscure grunge band TAD had several songs based on fantasy themes.
Clutch throws in D&D references into their lyrics at times, and they've done a few fantasy-based songs. Red Horse Rainbow was one, and 24 Earth Years was such self-indulgent satire that it was released as an 'outtake'.
In a similar vein, you have "Zetsubou Billy" and "What's Up People" from Death Note, with lyrics that tie in well with the series' premise. Also in one video they incorporate the name Kira into the lyrics. 
British Post-hardcore/alt rock upstarts Fightstar seem to have a big obsession with Neon Genesis Evangelion. This is evidenced in songs like "Shinji Ikari", "NERV/SEELE", "Unfamiliar Ceilings" and in "Lost Like Tears In Rain." In fact it's frequently commented that the cover art for their debut album is very similar to the ruins found in the aforementioned series.
Slipknot's debut album Mate. Feed. Kill. Repeat. has songs relating to Werewolf: The Apocalypse as Anders Colsefni, lead vocalist on the album was a fan of the game. However, Mate. Feed. Kill. Repeat has a much different style to the rest of the bands discography and following line-up changes, the current band currently considers it only a demo.
While not metal, the unquestionably heavy (and awesome) hardcore punk band Misfits have songs almost exclusively based on horror films from the 1950's and 60's. Classics include; THEM!, Where Eagles dare, Crawling eye, This island earth and Astro Zombies.
Misfits spanned a whole punk sub-genre called Horrorpunk, which is all about references from horror films, they adopt a visual style that is inspired by cult horror films such as ghoul make up and lots of black clothing.
In a similar vein, Psychobilly (A mix of Rockabilly with Punk) do a lot of shout outs and homages to the horror genre.
Also worth of notice is Deathrock, although they tend to be less explicit about horror films, instead adopting the atmosphere and look of said films rather than direct references.
High on Fire's lyrical content seems to be almost exclusively along these lines. One gets the feeling they just set their D&D campaigns to music.
One of the more famous examples, the stoner metal band Kyuss was originally called the Sons of Kyuss. Sons of Kyuss are an undead monster from the original AD&D Fiend Folio, with Kyuss being their horrific worm-god. (And yes, the band got the name from the monster, not the other way around.)
In 3.5 they went by the name Spawn of Kyuss (the monster). Which would be a more badass name for a band. Maybe a tribute band?
Electric Wizard makes frequent references to fantasy and horror literature. Their album "Let us Prey" has a quote from "The Outsider" on the back cover and a list of authors cited for "lyrical inspiration" in the booklet, which includes H. P. Lovecraft, R. E. Howard and C. A. Smith among many others.
Dreamtale. Would be worth including even if they had only "Lady Dragon", but there's more.
The Italian metal band Trick Or Treat has made covers of openings from cartoons with medieval or fantasy themes. Among them Robin Hood and David the Gnome.
Related to the main trope, many heavy metal bands have names taken from Tolkien, including ones that aren't thematically very fantasyish — Cirith Ungol, Amon Amarth, Ephel Duath (who are most known for combining metal and free jazz) are a couple.
There are a couple of fanbands which do metal arrangements of Touhou music; one of the more well-known ones is Unlucky Morpheus.
Though the Consortium Of Genius tend to write about random subjects, and obviously mad science in particular, they've tried this a few times such as "Milk" and "Mallet of Metal".
There are several bands related to Tolkien's works listed on this page.
Nanowar Of Steel, which parodies a lot of Metal genres, has a couple of such songs, including "Look At Two Reels" where they explain that you need to "read at least seventy times the Lord of the Rings" before listening to such a song.
"War in the Middle Earth", a Tolkien-inspired Screamtracker 3 song by Skaven of the Future Crew.
The Eagles did what for them was a strangely out-of-character instrumental track called Journey of the Sorcerer. This might have remained an obscure oddity, except that in 1979, a then-obscure BBC radio comedy-drama was looking for a theme tune where the royalties were not going to break the bank. Douglas Adams loved this tune and thought it was just odd and atmospheric enough - as well as relatively cheap to use. Expecting his radio comedy show would last for six episodes and no more, performance rights were acquired. And thirty-five years on, the The Hitch Hikers Guide To The Galaxy is still synonymous with this theme music...
And now something different: Irish folk-rock band The Horslips were trail-blazers in marrying traditional Irish music to rock instruments and rhythms. Two of their LP's, Tain Bho Cuilagne (The Tain) and Lebhair Gabhala Eireann (The Book Of Invasions) set Irish mythology of the Mithril Age to music, largely updated Irish folk standards with new lyrics based on the myths, re-arranged for rock band plus traditional instruments. Blending traditional Irish music and modern rock instrumentation on both traditional and electric instruments, this band is credited with being the father of the Celtic Rock movement.
British folk-rockers SteeleyeSpan, a band who followed on closely from the example of the Horslips, only with mainly English traditional songs, do a bit of fingers-in-the-ear Heavy Mithril. Tracks like Seven Hundred Elves and Drink Down The Moon are good examples. After their take of The Two Magicians influenced one of Terry Pratchett's Discworld novels - Equal Rites - Steeleye became more closely associated with Pratchett and most recently have collaborated with him on a musical version of his novel Wintersmith
Progressive Rock / Progressive Metal
Early 70's Uriah Heep, most notably "The Magician's Birthday"
Not to mention "Demons and Wizards"
Rush The entire later half of the 70s was Heavy Mithril with Rush, with at least one fantasy-based song per album, culminating in Hemishpheres, which side A is a Sci-Fi/Fantasy concept album, culminating in a song about Trees arguing, and an instrumental trip through a Alice in Wonderland-esque nightmare. Their catalog from this time period could be the soundtrack for any given Final Fantasy game.
On Fly By Night- "By-Tor & the Snow Dog" (a battle between good and evil in near Rock Opera form) "Rivendell" (Obviously about Elves)
On Caress of Steel - "the Necromancer" a moody song about triumph over, well, the Necromancer, and "The Fountain of Lamneth"
2112- The title song (which takes up the entirety of Side A) is based, very loosely, on Ayn Rand's Anthem
On A Farewell to Kings, the title song (loosely, it's about vague evil kings. They could be talking actual historical Kings, or fictional ones), Cygnus X-1, about a trip through a black hole, serves as a prologue to a song that culminates in a part 2 on another album (the aforementioned Hemishpheres) which is a Mount Olympus-based fantasyland in the literal sense (and metaphorically about the id, ego and superego), and "Xanadu", a song about a quest for eternal life gone wrong, loosely based or inspired by the Coleridge poem Kublai Khan.
Moving Pictures- "Red barchetta" is set in a future where at least some kinds of cars (fast ones anyway) have been banned.
Blue Öyster Cult loved this trope. Aside from the aforementioned Moorcock collaborations, many of their songs dealt with sci-fi and/or horror themes. They got their name from an alien cult from a never-finished Lovecraft-esque concept album cycle planned by their manager and drummer. Aside from that, they had songs about vampires, aliens, Hell, eldrich abominations, and let's not forget one of their biggest hits, "Godzilla," which was about... well, take a guess.
British space rock band Hawkwind also worked with Moorcock, including no less than three poems based on The Eternal Champion in the "The Warrior on the Edge of Time" album, and ultimately releasing The Chronicle of the Black Sword as a Rock Opera summary of the Elric saga.
Moorcock actually defected from the Hawkwind camp to the B.Ö.C. because the Americans were prepared to pay more for the songs. This caused strife and a lawsuit, as Hawkwind (or to be more precise, its litigious band leader Dave Brock) alleged the songs Black Blade and Veteran of the Psychic War had been initially promised to them. They lost, however, and B.Ö.C. got the songs. Hawkwind just got the bill, another thing disgruntled band members hold against Dave.
Hawkwind went away, pointedly dropped Moorcock as inspiring daemon, and wrote songs based on Philip José Farmer's sci-fi/fantasy instead.
Ayreon's entire shtick. More a music project than a cohesive band, all but one of the seven full albums dedicated to the songwriter's sci-fi/fantasy epic about the creation and doom of humanity, which pulls in robot uprising and King Arthur in the first album alone. It only got more ambitious from there.
And one album that deviates from the overarching concept is made up of stand-alone songs that are all based upon science fiction films and books.
And spin-off band Star One is even worse. Not only is the band named for Blake's 7, but their song "Intergalactic Space Crusaders" is a Filk Song given the Up to Eleven treatment, complete with the two singers essentially playing the parts of Blake and Avon. Star One also cranked out songs about Dune, 2001ASpaceOdessey, Star Trek, Star Wars...you name it, they've probably got a song for it.
Also, lead singer/rhythm guitarist (who also does lead guitar when not singing) Claudio Snachez has a solo (don't let the drums fool you; everything but the guitar seems to be synthesized) side-project, the Prize Fighter Inferno, which acts, currently, as a prequel to CoCa's SF story.
Monuments' second album, The Amanuensis, has a storyline set in a fantasy world inspired by Battlestar Galactica and the Samsara cycle, with a Shout-Out to Harry Potter in the song "Horcrux" (the character has to deliver a piece of himself to the "gatekeepers" of the Garden of Sankhara". The storyline and lyrics were entirely created by vocalist Chris Barretto, who is very much One of Us.
Crack the Skye is a Concept Album about a quadripalegic man who learns the secrets of astral projection, gets lost while exploring the cosmos, falls back in time to Czarist Russia, and has adventures involving Rasputin, the Czar, and Satan. And it is AWESOME.
Semi-fictional example in The Rotters' Club, where two of the members of the protagonist's school band want to be punk and two of them want to be Tolkien-inspired Prog Mithril. The schism comes to a head in the middle of a song, as the drummer gets fed up of not doing anything and starts pounding away, and the singer joins in screaming the first words that come into his head.
Serenity has mostly lyrics about quests and stuff. Their song 'To Stone She Turned' is about Medusa. They are not related to the movie. And they are fucking awesome.
Symphony X, especially "The Odyssey," which is Homer's epic of the same name, plus metal.
Special note should also be given to their albums "The Divine Wings of Tragedy", "Twilight in Olympus", and "Paradise Lost", which cover this trope to various extents.
Savatage. They had a weird combination of fantasy and space opera early on, but "Sirens," "City Beneath the Surface," "Hall of the Mountain King," "Hounds," and "The Unholy" all qualify (and are from four different albums). Prior to "Streets," they thrived off Heavy Mithril, space fantasy, and rock anthems.
Dutch metal band Arkngthand entitled their first album "Songs Of Fire And Ice", and their songs all relate to the books. "Game of Thrones", for instance, summarizes Ned Stark's story arc in the eponymous (first) book.
Jethro Tull could easily be the Trope Codifier. Many of their songs reference old Celtic customs and talk about medieval England. Minstrel in the Gallery, Songs from the Wood, and Heavy Horses (the albums, though the songs themselves also count) do this the most.
The cover of Broadsword and the Beast not only features a fantasy painting of Ian Anderson as some sort of evil-looking fairy, but also the border contains the lyrics to "Broadsword" written in Elvish.
Progressive rock band Marillion named themselves after The Silmarillion, although for copyright reasons they had to settle for a clipped form of the name. That said, very little of their music is fantasy-based apart from the early song "Grendel", inspired by Beowulf.
Citizen Cain is a symphonic prog band who although not prolific (six albums in 30 years!) are are at least consistent. Their songs weave folklore, mythology, fairy tales and the more bloodthirsty parts of history into a very dark tapestry.
Many songs by the rock band Styx fit this trope: "The Grove of Eglantine," "Jonas Psalter," "The Serpent Is Rising," "Man of Miracles," "Born for Adventure," "Come Sail Away," "Castle Walls," "Lords of the Ring," and, of course, their Concept AlbumKilroy Was Here.
Soulgrind made a concept album called Whitsongs based on poetry of Finnish poet Eino Leino, whose poems were often based in Finnish mythology.
Muggle Death Camp, a side project of Jim Wicked as a release/way to further hone his musical skills, is Harry Potter-themed. The music itself is fairly vanilla as far as black/death metal goes, but the lyrics side with the Dark Lord, resulting in a song titled "To My Death Eaters", a planned Concept Album centered around the seven Horcruxes, and Mr. Wicked declaring it VOLDEMETAL.
A strange case with Dimmu Borgir (means "Dark Castles" in Icelandic, and taken from the Dimmuborgir lava field in Iceland). They claim to be a "Viking band," but so many of their songs seem less concerned with their celebration of Norse mythology than with their declaring themselves accursed pawns of the Devil and screaming lyrics so anti-Christian that they border on hate speech. (Their song "Tormentor of Christian Souls" was so graphically violent that their record label refused to publish the lyrics.) Dimmu Borgir have gone on the record to state that they don't hate Christianity per se, just the more hierarchical aspects of it. They also have a farcical sense of humor and aren't above including sexy babes or Visual Puns in their album artwork.
As one might expect from a group called Nazgűl, all their lyrics are Tolkien-based. What might not be expected is that they are all written in Latin.
The French black metal group The Great Old Ones, as one might expect from their name, writes songs based on the Cthulhu Mythos.
Epic black metal band with folk influences Rivendell. They have released three albums from 2000 to 2005, but current line-up consists of a single member.
Melechesh, originating from Jerusalem but now located in The Netherlands, uses lyrics based on pre-Abrahamic Assyrian lore and uses a lot of traditional Middle Eastern instruments. They describe themselves as Assyrian Metal.
Dutch Black Metal band Carach Angren not only takes their name from the Silmarillion, but they also have produced two concept albums centered around Dutch folklore. The second one, Death Came Through A Phantom Ship, is about the Flying Dutchman.
Australian band Portal (no, not the game) does songs entirely on Lovecraft's works.
Swedish death metal pioneers Unleashed are noted for their use of Viking/Norse imagery in contrast to the more gore-oriented themes of many of their contemporaries. They even write songs based upon Lord of the Rings on occasion
Amon Amarth are in a similar longboat as well. Interestingly, they claim they've called themselves "Amon Amarth" just because it sounds fun, never even reading Lord of the Rings.
Black Sabbath, as mentioned above, made the occasional foray into the genre, with The Wizard apparently having been inspired by Gandalf the Grey, and The Wall of Sleep being titled in reference to a Lovecraft story.
Ronnie James Dio first came to prominence in the early 70s with a band called Elf. Let's just leave it at that.
Iron Maiden's Piece of Mind ends with the song 'To Tame a Land', a retelling of Frank Herbert's Dune.
Hetfield said he wanted to make the title more accessible, so he changed 'The Call of Cthulhu' to 'The Call of Ktulu'. He has since said that he regrets the decision.
"The Thing That Should Not Be" is also inspired by one of Lovercraft's Great Old Ones. (probably Cthulhu too)
Absolutely not, the thing that should not be is Nyogtha
Wordof God has it based on "The Shadow Over Innsmouth."
"Of Wolf and Man" off the Black Album is about, you guessed it, werewolves.
Most recently, 'All Nightmare Long' on their 2008 album Death Magnetic, which is about the 'Hounds of Tindalos'.
James Hetfield: It was an attempt to get back to the H.P. Lovecraft mythos with Thing that Should Not Be, Call of Ktulu.[sic] This was about the Hounds of Tindalos, which was another crazy mindfuck about these wolves that hunt through their nightmares and the only way you can get away from them is stay with angels. You can't even escape through sleep.
Led Zeppelin would have to be the Ur Example, having referred directly and indirectly to Tolkien's Legendarium in a number of songs, including Ramble On, Stairway To Heaven, The Battle of Evermore, Misty Mountain Hop and Kashmir.
Lordi might count. They sing metal, they dress up as monsters and at least some of their songs have a fantasy-ish theme.
The albums The House of Atreus part 1/part 2 by Virgin Steele are retelling the story of Agamemnon's lineage. "The Marriage of Heaven and Hell Part Two" is mostly about European myths (Prometheus, Norse Gods and Ragnarok), while "Visions of Eden" is a Gnostic interpretation about the creation story with Adam's first wife, Lilith.
The entire genre of "Viking metal", a European subgenre including bands like Amon Amarth, Turisas, Equilibrium, Ensiferium, and their ilk, whose songs are about Vikings and Viking mythology... and it is awesome.
The similar style of Celtic metal, represented by such bands as Primordial, Cruachan and Waylander, takes a similar approach to Celtic mythology, although for the most part these bands lack the (relative) exposure of their Nordic cousins, with the possible exception of Eluveitie.
In a similarly nautical vein is Scottish band Alestorm, which define themselves as playing pirate metal, and includes in their catalog a metal version of the Scottish national anthem.
Turisas, which was mentioned before, made a song called "Rex Regi Rebellis", which is based on Finnish epic historical novel called "Tales of a Field Surgeon". There is actually a quote read from the novel in the intro narration to the song.
Judas Priest's "Lochness" is about, well, the Loch Ness monster.
Not to mention the entire Nostradamus album, which is about... well, guess.
Pagan Altar's "The Rising of the Dark Lord" is pretty much a tribute to Sauron-esque Evil Overlords.
Powerglove's repertoire is almost entirely made of videogame soundtrack covers, except for ...an instrumental cover of the first Power Rangers theme song. They also did an album dedicated to 80's/90's cartoons.
Korpiklaani, from Finland. Many songs reference elements of Finnish paganism, such as the "God of Wind" and "Spirit of the Forest". Their song Wooden pints is about "little men from underground", probably dwarves.
Battlelore, where pretty much 90% of their material is about Middle-Earth somehow.
Slough Feg's 2003 album Traveller takes the shape of a Rock Opera based on the tabletop game of the same name. More references to the game are dropped on some of their other songs, like "Traders and Gunboats" and "Psionic Illuminations". And it is awesome.
Not to mention that they take their name from Lord Weird Slough Feg, a villain of the 2000AD comic Sláine, which they also reference in a few songs, like... "Slough Feg".
The band Stovokor performs heavy metal in Klingon, and in costume.
The band SuidAkrA, with songs about the fate of the Ninth Legion in "Caledonia" and another centered around the legends of Cuchulain.
The one about Cuchulain is "Feats of War."
The Sword, a Doom Metal band whose music is largely inspired by the works of Robert E. Howard, Arthur C. Clarke, and others. Their second album contains a song named after, and based on, the Conan the Barbarian story "The Frost-Giant's Daughter", as well as "Fire Lances of the Ancient Hyperzephyrians", a song about a primitive tribe worshiping nuclear bombs After the End. Their third album, Warp Riders, is a medieval fantasy-mated-with-science-fiction Planetary RomanceConcept Album set on a tidally locked planet.
The college band Klövenhoöf, a Neanderthal / Conan themed band, combined this trope with Heavy Metal Umlauts. They appeared on stage in bearskins, dueling with a dragon head mounted on a crane.
The post-grunge band Breaking Benjamin's song, Home, is based on The Wizard of Oz.
Manowar - The heavy metal band that sings about how glorious metal is, how glorious Vikings are, how glorious Norse gods are, how glorious fighting is, and how glorious Vikings fighting for heavy metal Norse gods is. They're also of the opinion that the Norse Gods made heavy metal.
Brocas Helm received a sudden boost in popularity from Brutal Legend and fits this trope. Many songs are about knights in battle, and they even have a song called Helm's Deep.
Heavy metal band Manilla Road are well regarded for their "thoughtful" fantasy, mythological, and horror based lyrics.
Unlike with Mercyful Fate, whose lyrics were usually satanic or occultist based, King Diamond's lyrics primarily deal with horror or occult fantasy themes.
Agent Steel have a lot of albums with apocalyptic and sci-fi themes, including the use of sci-fi samples
Along with war themes, Jag Panzer also have their fantasy lyrics. They also released a concept album based on Macbeth.
Parodied by the Italian band Gli Atroci in their song I Guerrieri del Metallo (The Metal Warriors), which is about a group of inept warriors who were recently defeated in battle because they had diarrhea, so they seek revenge, but they are ambushed by the enemy behind a hill, so they run away to save their asses (that's how the song puts it) and return to their village, where they tell lies about the battle to their wives.
Def Leppard's first album, On Through The Night, a much heavier album than their hair metal days, has the song "Overture" which includes such fantasy staples as silver warriors, destroyed cities and prophetic priests, but could be possibly be referring to [After the End].
Dethfrog by Bad Dudes is a Heavy Metal song about Frog.
Hammers of Misfortune's debut album "The Bastard" has Heavy Mithril written all over it. The album is split in three parts and tells the tale of a bastard son who had been left for dead by his father and seeks revenge later in life with the Blood Ax.
French band Weirdland, with track like "Valhalla for reward", "Nazguls on your back" or "Immortals of stone".
Blind Guardian practically is this trope. Most of their catalogue is about either Tolkein ("Lord of the Rings," "Harvest of Sorrow") Moorcock ("Journey Through the Dark," "Quest for Tanelorn"), George RR Martin ( "A Voice in the Dark," "War of The Thrones), or Stephen King, specifically The Dark Tower ("Somewhere Far Beyond," "Carry the Blessed Home").
"Ride into Obsession" and "Wheel of Time" are based on the Wheel of Time series by Robert Jordan.
Had Epidemia never put out any song except "Fëanor," it would have been enough.
Iced Earth does a similar thing to Blind Guardian, but with a more demonic theme, especially their latest albums. They also made an entire album dedicated to Spawn (yes, the comic book character)
Consider also "The Glorious Burden: Gettysburg 1863," thirty minutes of metal about the Battle of Gettysburg. Not fantasy, but similarly epic. Also, the Something Wicked saga.
I bet you'll never guess what the song "Dante's Inferno" is about.
Iced Earth and Blind Guardiancombined to make Demons & Wizards. Among other things, they have an entire album dedicated to Stephen King's The Dark Tower, however Hansi Kursch has stated that many of the songs have more than one meaning, and are more related allegorically, such as songs about Captain Ahab which reflects Roland's quest.
Many songs by Nightwish, including "Elvenpath", "Wishmaster" (which directly references Dragon Lance), "The Escapist", "Return To The Sea", "Nightquest" (which is also a brief history of the band), "7 Days To The Wolves" (based on The Dark Tower), and "White Night Fantasy". Their earlier material has more overt Heavy Mithril than their more recent music.
Edguy is a symphonic metal act that uses metaphorical lyrics that allude to metaphysical and social themes, often expressed using esoteric or hermetic expressions that tend to give their songs a kind of classical epic feel that is very much in line with power metal. "Vain Glory Opera" is perhaps their best known album, but they've done a lot of other songs.
From Helloween came Gamma Ray, founded by Kai Hansen. Could probably be described as Space Metal....mostly. Though there's also horses from other stables. Like rather TroperrificThe Winged Horse. Sort of Return To Fantasy.
And from Gamma Ray came Even-More-Space MetalIron Savior, founded as a sort of side project by Piet Sielck (who used to be in Helloween) with Kai Hansen. Continues in the "Space Metal" oeuvre, with the main focus of several of the albums being the story of a sentient spacecraft (the titular Iron Savior), which is somehow related to the lost city of Atlantis. Only the first three album from Iron Savior are concepts linked to the titular Space Fortress (from the lyrics it sounds more of a Death Star than a spaceship), the fourth one contained some songs mentioning a new Iron Savior story but also unrelated material, by the fifth album Iron Savior the songs and meaning have got much more subtle and seem like just another power metal band with a penchant for futuristic lyrics. But it doesn't make them any less awesome!
Kamelot: Their albums Epica and The Black Halo are concept albums based on the story of Faust. Incidentally, despite their name, "Shadow of Uther" is their only song based on King Arthur.
So is the bonus track from Karma, "Once and Future King".
The song "Across The Highlands", also on Karma, seems heavily influenced by Highlander.
22. Why do you play? For the king, for the land, for the mountains, for the green valleys where dragons fly, for the glory, the power to win over the dark lord!
23. Not to mention the right to write an album based on a crappy 80's fantasy movie. Why isn't "Willow" a five disc series yet?
3 Inches of Blood practically thrives on this trope to the point where if their lyrics were sung by anyone else, they would be mocked for being narmtacular while 3 Inches of Blood make people raise the horns and head bang.
Destroy Destroy Destroy adds towering, Lord Of The Rings-esque symphonic arrangements for extra hamminess, but with an album called Battle Sluts, they're clearly not as serious about it. (Stylistically, by the way, they're American power metal with harsh vocals.)
Manticora from Denmark released an aptly-titled album named Hyperion in 2002 which is based on the first novel of Dan Simmon's Hyperion Cantos. Two other albums has a HP Lovecraft quote in the introduction, and "Roots Of Eternity" follows with a mention of The Great Old Ones in the next track. Add "Dragon's Mist" (Arthurian Legend), "Felice" and "The Nightfall War" (Saga of the Exiles) in between...
Epica, name derived from the Kamelot album of the same name, combines some Heavy Mithril with lots of social commentary. Their target of choice is usually organized religion, which one album calls the "Divine Conspiracy" to enslave humanity.
While not strictly fantasy, Adramelch's primary focus is medieval themes.
The US power metal band Omen have been described as "Conan metal"
Stormwitch album War of the Wizards is based on The Lord of the Rings, but (according to The Other Wiki) the copyright issues at the time forced the band to change the names of the characters (for example; Aragorn to Aaron).
Ladies and gentlemen, we now have a complete ten-album chronicle of the wars of a distant land.
Skylark. Take Bring Me the Head of Prince Charming, turn it into symphonic metal opera, then push "Epic" slider up, but not so far that Boris Vallejo covers vanish, and you have this.
Lyriel - The lyrics to "Lind e-huil" are in Sindarin.
A number of opera plots draw heavily on fantasy themes, making this Older Than Radio.
Perhaps the best example is Der Ring des Nibelungen (The Ring of the Nibelung) by Richard Wagner, which is a series of four interconnected operas drawing on Norse Myth to tell an interconnected story. It's considered to be one of the most thematically and musically complex operas existing. Anyone get the feeling that if Wagner were alive today, he'd be writing concept albums?
What makes it even more awesome is that the members of the band are staff members, and the lead singer is the Art Director, Samwise Didier. Who is also cover artist for quite a few Metal bands, including the below mentioned Hammerfall, and an avid fan.
They've recently come out with songs on Blizzard's other properties as well and are featured in Starcraft II, where a commercial refers to them as Level 800 Elite Tauren Chieftain.
They appear in WoW, too, as the Tauren Chieftans. They can bee seen performing in Shattrath, at the Darkmoon Faire, and in a few other places, and hanging out with their tech crew in Silvermoon when they're not rocking out.
Another WoW example: One of their April Fools' Jokes was to introduce the Bard class, and depict him as a hair-metal guitarist whose abilities you invoked by playing notes on a Guitar Hero-esque highway.
A rarer sci-fi variation can be seen in the credits of Homeworld, where the song "The Ladder (Homeworld)" by Yes recaps the story of the Kushaani's epic voyage to their original homeworld, Hiigara. Notably, while it's done as a rock ballad, the lyrics are reminescent of a cryptic ancient chant straight out of a mythic retelling of their famous journey.
Parodied in Achewood, in which serial killer Nice Pete and burnt-out hard rocker Lyle form a band named "Mister Band." Their output falls squarely in this category. Lyle, being more of a traditional metal fan, becomes resentful of this.
Inverted in the Order of the Stick prequel, On the Origin of PCs. Roy found a pack of villagers who begged him to save them from some bad-tempered orcs that were hanging around and wouldn't leave. Turned out the orcs were teenagers, who were camping there to await an upcoming rock concert... in a Mithril setting.
What if Mighty Thor wielded an axe instead of a hammer? You get Valhallen, the Viking god of rock, from the "Justice Friends" shorts on Dexter's Laboratory.