Capcom vs. Whatever/Awesome Music

Marvel vs. Capcom

Let's start this by mentioning that the Character Select music in MVC3 (plus its orchestral version) will pump you the fuck up. Even it seems overjoyed that the third game has finally come out.
The first MvC and its successor Tatsunoko vs. Capcom have Roll of Mega Man fame as a playable character--she has the only theme with vocals in the games, "Kaze yo Tsutaete".
Courtesy of Mega Man 2, Marvel vs. Capcom presents the Blue Bomber himself.
Cammy's wonderful theme in X-Men vs. Street Fighter.
Tron Bonne in 3 has "Flutter vs. Gesselschaft", inherited from Volnutt's theme in Tatsunoko vs. Capcom and, obviously, Mega Man Legends.
Zero's remix of his Mega Man X 2 theme.
On the Blackbird, Storm's theme in X-Men: Children of the Atom.
- Storm's Marvel vs. Capcom 3 theme is also great.
  - Which is a remix of her X-Men vs. Street Fighter theme.
Captain America's theme in Marvel vs. Capcom, and its remix in 3.
- And lest we forget, the original from Marvel Super Heroes and the Marvel Super Heroes vs. Street Fighter version.
Spidey's theme. Every single rearrangement.
Wolverine's theme in MvC1 and its MvC3 remix.
- His XvSF theme is pure adrenaline, while his MSHvSF theme is surprisingly chill; in other words, Capcom managed to perfectly capture almost every facet of Wolvie's personality. In musical form.
  - Of course, the XCotA and MSH versions are nothing to sneeze at, too.
Gambit's theme in MvC1.
- Still one-upped by the original from X-Men vs. Street Fighter. Don't mess with the Cajun!
  - While it's just a fan-made remix this definitely makes you wish he was MvC3.
Deadpool's theme, which will drill its way into your head and pester you forever... just like Deadpool.
There's also the theme of Onslaught.
The Capcom side also gives us Strider Hiryu and Jin Saotome.
Ahem... Captain Commando.
To match his Devil May Cry 3 look, Dante brings an awesome remix of the already awesome "Devils Never Cry".
Albert Wesker takes "Winds of Madness", his incredible Resident Evil 5 theme, makes it rock out loud, and proceeds to SATURATE MvC3 with his awesomeness.
While it could originally be considered The Scrappy, the length of time between the release of MvC2 and MvC3 has finally brought "(I Wanna) Take You For a Ride" (the character select theme from MvC2) to this level. More than a few fans screamed in joy when it was heard being played at the end of the Tokyo Game Show trailer for MvC3.
- Marvel vs. Capcom 3 has several remixes of "I Wanna Take You For A Ride", even a rock remix.
Do you want to know why the Dread Dormammu is even more powerful in the Dark Dimension? Obviously, it's because he's enchanted it to play this at all times.
Amaterasu brings a remixed version of the godly "The Sun Rises" to accompany her godly ass-kicking. You know a song is awesome when it's a CMOA in three different games.
Chun-Li's theme from MvC1.
The Juggernaut's theme, bitch!
MvC3 takes Magneto's theme from X-Men vs. Street Fighter and injects it with PURE AWESOME.
- The Master of Magnet also had these stellar themes.
Behold! The theme of Dr. Victor von DOOM!
- And for the obligatory MvC3 remix... feast your ears on this.
Shuma-Gorath's epic theme!
- Here's his theme in MSHvSF. And then, MvC3 decides to take his theme and make it rock the f*** out.
Dadada dunda dunadunaduna dununununu...
Chris Redfield's theme.
RAAAAAAGGH! Everyone forget Hulk's theme! Hulk's theme SMASH all other puny themes in game!
- The MvC rendition of the above theme. It's not quite as adrenaline-packed, but still good nonetheless. Also, his themes in Marvel Super Heroes and MSHvSF.
SWEET GAMMA-POWERED RAVE PARTY! ... Wait, that sounds kinda dangerous.
M.O.D.O.K.'s theme. It fits particularly well with trolling sprees.
Iron Man's theme in MvC3, which is a techno-rockified version of War Machine's theme in MvC, which in turn was a reworked expansion of Iron Man's Marvel Super Heroes theme. Confusing, right?
How much of Spencer's theme is ~~bionic~~ awesome? All of it.
Morrigan's theme in the original Marvel vs. Capcom sounds like it'd be the perfect fit for some kind of lighthearted rave in the underworld.
- And then we have her theme in MvC3, based off of her Night Warriors theme (also, see the Tatsunoko vs. Capcom section). It's quite mystifying.
While XvSF and MvC did the obligatory spin on the RED CYCLONE, Zangief himself, it is his MSHvSF theme that truly shines.
Speaking of Russians, here is Colossus' theme from X-Men: Children of the Atom.
Moon Light, Psylocke's theme in X-Men: Children of the Atom. Her theme in Marvel Super Heroes qualifies, too.
BEHOLD!! OPTIC BLAST!!! Dreams don't die, huh? Got that right, Cyclops.
Super-Skrull's theme.
Since Marvel vs. Capcom was more diverse on the Capcom side than being just being Street Fighters, they gave Ryu, the main representative of Street Fighter series in the game, the Street Fighter II main theme itself.
M. Bison's theme from Marvel Super Heroes vs. Street Fighter. Just makes you wanna yell out "YES! YES!"
Thor's theme, fitting for a god of Asgard.
C. Viper's MvC3 theme which is a remix of her Street Fighter IV theme.
Mayor Mike Haggar Turned Da Beat Back!
Taskmaster's theme will remind you of who is the asskickee, and who is the asskicker.
This remix of Akuma's iconic theme is... just listen!
- And it was just as awesome back in '96. Oh, and here's his MSHvSF theme for good measure.
Sentinel's Marvel vs. Capcom 3 theme is epic!
- Just like it was 17 years ago.
In Marvel vs. Capcom 3, Jill gets a dance remix of her RE5 theme, "Sad But True". Put yer dancing shoes on!
The Deep, Omega-Red's theme from X-Men: Children of the Atom. In MSHvSF, it's revamped with a pretty sexy sitar that makes his theme "almost as Hindu as Dhalsim's."
"Birdy! Play my swinging theme!" "Yes, boss!"
Every single Street Fighter theme found in X-Men vs. Street Fighter.
- In turn, '97's Marvel Super Heroes vs. Street Fighter marked a stark deviation for the Street Fighters, as none of them retained their iconic leitmotifs, giving Capcom the chance to get creative. Make sure to tune in to stuff like Ryu, Ken, Chun-Li, Sakura, and Dan.
Galactus' theme. Fittingly epic, considering the person in question.
X-23's theme. Probably the Marvel side's equivalent to Roll's theme.
Hsien-Ko's theme.
Phoenix's theme.
The Victory/Outcome/Results theme from 3. You'll want it to play any time you win anything.
With Ultimate MvC3 on the way, there's some new themes to go with the newcomers.
- Firebrand/Red Arremer's theme, a bitchin' metal remix of the Gargoyles Quest intro.
- Strider Hiryu's theme, a triumphant reprise of his MvC1 theme (and by proxy, Stage 1 of his original game).
- Ghost Rider's theme, almost the polar opposite of Dormammu's.
- Hawkeye's theme, a funky, catchy beat that compliments his personality well.
- Doctor Strange's theme, which has a very appropriate mystical, otherworldly feel to it.
- Nemesis' theme, a RE5 remix of his RE3 theme, gives an extremely menacing feel.
- Vergil's theme is an awesome, yet slightly melancholy, symphonic rock remix of his second boss battle theme from Devil May Cry 3. Seeing as it was technically the only time Dante and Vergil were on even ground, this is perfect.
- Iron Fist's theme, which mixes Chinese instruments, pop, and rock together in a glorious fashion.
- Nova's theme takes spacefaring theme elements, like a sweeping chorus, synthesizer sounds, and sweet guitar riffs, and puts them together in one incredible, high-energy piece.
- Phoenix Wright's theme, a remix of "Objection - 2001" from the first Ace Attorney game.
  - Until you go into Turnabout Mode, where Wright's more iconic theme "Pursuit - Cornered" starts playing in a fashion that would make Bang Shishigami proud.
- Frank West's theme, a remix of Adam the Clown's theme is very catchy and surprisingly fitting.
- Rocket Raccoon's theme is a heroic sounding tune that'll no doubt get one pumped up in battle.
You thought vanilla MvC3's character select themes pumped you up? Their Ultimate versions will get you even more psyched. The classic version adds an electric guitar into the mix. The dynamic version? It adds a freaking chorus.

Capcom vs. SNK

The themes for M. Bison and Geese Howard from the original CvS.
- Hey now! Don't leave out Akuma, ok?
Nakoruru's theme from Capcom vs. SNK. Probably the best track of the entire OST.
The boss battles for Shin Akuma and Ultimate/God Rugal from Capcom vs. SNK 2 are also awesome.
- Also from CvS2, True Love Makin', Fight with the Wind, Fight Your Way, Stimulation, Happiness, Nebuta, Wicked Fight, and Real Eyes.
- And who could forget Wipe Out, the theme of the Osaka stage (which sounds pretty much like Lei Wulong's Tekken 3 theme [moreso the OST version than the AST remix] and "Steam" by East 17)?
- True Spirit is a very somber and atmospheric piece. It really sets the mood for big battles against guys like Bison, Geese, Akuma, and Rugal.

Tatsunoko vs. Capcom

When you face Yami's final form in either CGoH or UAS, he brings his world's Crowning Music of Awesome, "The Sun Rises!", with him.
Cross Generation of Heroes is chockful of it simply because every Anime Theme Song for the Tatsunoko Production characters and each Capcom character's respective Crowning Music of Awesome is mashed together into one game. The reworkings of some of those themes makes these even more awesome than their original counterparts:
- Ryu's theme (Street Fighter II's Japan stage)
- Chun-Li's theme (Street Fighter II's China stage)
- Ken The Eagle's theme (WHOA! GATCHAMAN!!!)
- Gold Lightan's theme (Golden Warrior Gold Lightan OP)
- Batsu
- Jun the Swan
- Kaijin no Soki
- Karas
- Morrigan
- The TVC version of Alex's "Jazzy NYC"
- Mega Man Trigger/Volnutt
- Hurricane Polymar
- Tekkaman (complete with SPACE LANCE!)
- And in what might perhaps be the biggest Ear Worm of all... Roll.
  - And here is the English version.
- Hakushon Daimaou's theme is a bigger Ear Worm.
- Yatterman-1
- Casshan
- Doronjo
- Ippatsuman
Even with licensing issues preventing the themes from being used in Ultimate All Stars, there's still great music:
- Wasteland
  - Even better when on fire!
- Les Vagas
- Daigo Temple (Moonlight)
- Uncharted Region of China
- Gesellschaft (Clear Skies)
- Willamette Parkview Mall
- And as a musical moment of Fandom Rejoicing, Orbital Ring Systems Cargo Bay.
- They also remixed the Character Select theme, and made it into a thing of beauty.

Other Capcom vs. Whatever Games

Namco X Capcom

Trembling City of Aris which was also remixed in Endless Frontier as "Alice in Fluxland".
"Brave New World", the opening theme of the game.
As well as this remix of Hsien-Ko/Lei-Lei's Night Warriors: Darkstalkers II theme, used by both her and Fong-Ling.
Jin Kazama and Heihachi Mishima's theme, a remixed version of the intro from Tekken Tag Tournament.
And speaking of Tekken, King II (alongside Felicia and Armor King I) gets an expansive rearrangement of the opening to Tekken 3.
Once again, MegaMan Volnutt and Tron Bonne use Flutter vs. Gesellschaft as their battle theme, from their home series.
Arthur has his theme from Ghosts N Goblins.
Morrigan's Darkstalkers theme, remixed.
The cast of Final Fight (Haggar and Guy, along with Sho/Ginzu) receive this rocking remix of the Bay Area from the original game.
The Captain & co. weren't left out either.
Stage 1 of Strider has never sounded so grand.
Kagekiyo from The Genji And The Heike Clans proves two things:

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Brave Sword, Braver Soul, from Soulcalibur II, accompanies Mitsurugi and Taki ontp the battlefield.
Gilgamesh and Princess Ki's theme, taken from The Return of Ishtar.
Didja know that this game made Taizo Hori (and Dig Dug in general) infinitely more MANLY? It did.
Taizo's ex-wife Toby Masuyo (of Baraduke) teams up with Burning Force's Hiromi Tengenji to bring you this hotness. Awesome must run in the (extended) family.
KOS-MOS, Shion, and MOMO bring the main battle theme of Xenosaga: Episode 1 with them.
Anyone else getting some Underworld vibes from Valkyrie's theme?
If you're listening to Stepping Wind, the theme of Klonoa and Gantz, the only appropriate response is a big "WAHOO!"
Regina and Bruce McGivern bring this hyperkinetic tune from Dino Crisis 2 in tow.
When you enroll at Rival Schools, don't expect an actual education. Expect a beating from Hideo and Kyoko instead!
Well well Demitri, shall we dance?
Well apparently, Lion - Irony of Fate has taken tips from Trombe to override the whole Tales of Destiny soundtrack for this game. Hell, whenever Judas appears, the enemy turn theme gets overriden with its awesomeness!
It wouldn't be a crossover without Street Fighter, so let's get these out of the way: Ryu, Ken, Chun-Li, Sakura (who even brings her rival-turned-friend Karin along for the ride!).
M. Bison, the head honcho of Shadaloo, makes an appearance with his Street Fighter Alpha 3 boss theme, Brave or Grave. Brings back memories, right?
Evil Profusion may not be her battle theme, but its sinister trance-like nature definitely fits Saya like a tee. It is then morphed into 61, the theme of the Final Boss.
Everything Is Within Battle, the enemy battle theme.
Facing the Wind.
Even the post-stage music is great!
Like An Old Dream, the music that plays during the epilogue, is a sound way to end the game, huh?

Street Fighter X Tekken

The remix of Tekken Tag Tournament's theme, for some of the SF vs. TK rival battles.
- Both remixes of Street Fighter IV' Volcanic Rim stage theme for the TK vs. SF rival battles.
For this game, Capcom gave priority to the Real Song Theme Tunes, as many songs were featured in trailers:
- Black Tide's "Honest Eyes", the de-facto theme for the game, featured in the intro of the game. It has definitely undergone the Grand Theft Auto Effect.
- Street Drum Corps' "Knock Me Out", used in the E3 2011 trailer.
- From the Comic-con trailer, Hollywood Undead's "My Town", which is SFxT's theme for everything Final Fight related.
- Rise Against's "From Heads Unworthy", for Bison/Juri Vs. Jin/Xiaoyu!
The Antarctica stage theme, a smooth mix of electronic beats and percussion, getting tenser or easier as the battle goes on.
The Pandora boss theme for Bison and Juri is a sinister combo of the two character's teams complete with Ominous Latin Chanting. Fitting for the Shadaloo and SIN team-up.
- There's also Jin & Xiaoyu's Pandora theme, crossing their themes, too!
The remix of Akuma's theme at the end of a Tekken character's Arcade mode. Probably one of the best, and most metal, versions of his theme yet.
How about the Mad Gear Hideout (Round 1) theme (also titled "Abigail Dancing" on the collector's edition CD), a sweet electronic remix of the Bay Area stage theme from Final Fight?
- Speaking of Mad Gear, round 3 features a remix of the FF opening.
The Mishima Estate Round 1 (rooftop) theme is a beautiful mixture of electronic and loud Asian instruments adapted from Heihachi's Tekken 2 theme.
- Speaking of Mishima Estate, Mishima Estate Round 2 throws us in what seems to be a gentle theme...until it kicks into Heihachi's Tekken 3 arcade theme. Suddenly, that nostalgic metal guitar from his theme kicks in, with mild electronics throw in, all while a sample of "Hey!" ties the theme all together.
Urban war zone is quite iconic thanks to the reveals of the Playstation-exclusive characters (Mega Man, Pac-Man, Toro, Kuro, Cole). It's got electric synth sounds mixed in with some sweet guitar playing and it makes you want to say "This is my destiny!".