Digimon/Awesome Music

The wonderful short songs instrumental that give each series of Digimon its unique mood (rock, classical, flute, jazz, etc.) feature in the Uta to Ongaku Shuu albums (two per series until Digimon Savers). Below are some links to listen the long(er) songs directly, but before, a link (with commentaries, but lots of loading) to a flipping good fan-made English translation of the first through fourth and the sixth Japanese openings (or, to simplify things, every pre-Xros Wars Kouji Wada theme), brought to you by these guys. Oh, if only (just video)

Adventure

 * "Butter-Fly", the very first opening. Also, its memorial theme, which features all the cast singing along.
 * Maasaki Endoh's take on "Butter-Fly" again adds awesome to an already amazing song. Or, for the most acurate piano version so far. It really demonstrates the complexity of the full songs, as anyone that tried playing digimon songs in guitar hero knows.
 * The female piano version (done by a singer from Nico Nico) is downright haunting.
 * What's better than a fan singing Butterfly? Why, a chorus of fans singing Butterfly!
 * Youtube installment, for those who have trouble navigating Nico.
 * Marco and Show-Z are famous for playing a great deal of hard rock covers. Here's one for Butter-Fly. You will be grooving.
 * The "Theater Size" rendition is a non-instrumental version of the chorus, immediately repeated with the electric guitar kicking in. Fall in love.
 * The latino version is just... just... oh, God.
 * César Franco is the voice behind a number of latino dubs of Digimon songs. Si Tú lo Deseas is his take on Butter-fly.
 * Be partial to Brave Heart. You will not regret it.
 * The instrumental version only played in episode 7 even tops it off.
 * Kouji Wada did us a wonderful favor by singing a version of it back in 2010.
 * The dub had plenty of it, too. Digimon Adventure's "Hey Digimon" was code for a Crowning Moment of Awesome approaching, and when they played the song out to a bit closer to its full length in the finale, it turned out pretty awesome, too.
 * Digimon, Digital Monsters, Digimon are the CHAMPIONS!
 * There was also an orchestral version they played in the movie and season 2 that took the dub theme into 5000 levels of epic win!!!
 * The eighth child Kari's theme, "Holy Light". I'm thinking of a different kind of "Holy" here.
 * The two ending themes in their full version qualify:
 * I wish, the first theme, sung by Mimi's voice actor.
 * Keep on, the second theme, as sung by AiM (Ai Maeda).
 * Both of whom happen to be, by pure coincidence, the same woman.
 * This troper doesn't know its name, but there's this instrumental piece in the Japanese version that tends to be played during Crowning Moments Of Awesome (Venom Vamdemon's defeat and the first appearances of Magnamon and Quinglongmon in 02, to mention a few) that he feels deserves more recognition.
 * Shouri ~Zen no Theme~, a strangely simultaneously eerie and beautiful track used to excellent effect in the last scenes of episode 21.
 * The very different, but very amazing Italian opening.

Adventure 02

 * "Bokura no Digital World", a memorial song for the first two seasons: all 24 starring cast members, the narrator, and the opening and ending song's performers.
 * Break Up! (yes the exclamation point is part of it) comes out in the top.
 * As well as this fan made guitar cover.
 * Also, Beat Hit. The beginning is concentrated awesome.
 * 02's English dub has "Let's Kick It Up", "I'm Going Digital", and "Run Around" (listed here in awesome, awesomer, awesomest order), which all put the first season's "Hey Digimon" to shame.
 * Ken's theme, "Only One".
 * The full ending themes for the second season:
 * Ashita wa Atashi no Kaze ga Fuku, the first theme.
 * Itsumo Itsudemo, the catchy second theme.
 * Don't forget Sun Goes Down, an incredibly sweet, gentle song. It plays in the last episode, leading to a Crowning Moment of Heartwarming.
 * Speaking of a Crowning Moment of Heartwarming, who could forget Friend ~Itsumademo Wasurenai~ at the end of the second movie?
 * The theme for the other 02 movie, Stand By Me ~Hito Natsu no Bouken is pretty great, too.
 * There's also the opening, Target: Akai Shougeki, which plays during many a Hot-Blooded Crowning Moment of Awesome.
 * Daisuke to Ken no Kaimono Carol. Once you've heard it, you will not be able to get it out of your head. Baby, kurisumasu da ze.
 * Why isn't Here We Go on here? The little, 5-second version that plays when they enter the digital world is awesome, but the longer version is EPIC.
 * So epic they HAD to use segments of the longer version in the dubbed version of the movie! (when Wargreymon and Metalgarurumon head into the internet to battle Diaboramon despite the fact that they had severe battle scars...it is truly epic!)
 * Most of the Image Song collections for the characters are certainly worth listening to, although Daisuke's and V-mon's are really about how awesome they are. Fast forward a year, when the Natsu e no Tobira CD Drama (The Door to Summer) comes out, yanking poor Daisuke up and down the whole damn street. The Narrative of the CD Drama is interspersed throughout with songs from the various characters, and Daisuke's occurs at The Climax. Reach For You showcases that Daisuke has grown up a fair bit (he's no longer singing off pitch); and hoo, boy, it shows.
 * Another good Daisuke song is his 10th Anniversary Special: Ashita. Much more cheerful than Reach For You, and much less depressing than Natsu e no Tobira.

Tamers

 * Digimon Tamers had plenty of great songs. Some only heard in the anime, like the sad but incredibly moving Saxophone with piano background version of The Biggest Dreamer, and some that were never even heard in the anime, and that (obviously) were never sold around the world.
 * Rika's theme from the Best Tamer album, Moon Fighter, that firmly established her as a Badass.
 * Beelzemon's theme, Black Intruder, which makes him a Badass Biker.
 * Hirokazu's theme, HeroKazu which makes him a beach boy
 * Starting Point, which has some interesting musical variations.
 * Anytime Moumentai, in which Terriermon's dual nature is comically exposed.
 * Never Ending Story is a more relaxed, but touching duet between Jeri and Leomon.
 * Jeri's alternate theme, Itsu ka no Iro or The Colour of Someday from the Digimon Girls Festival, is for lack of better word, street. Words cannot spoil the surprise of the tune.With lyrics
 * Finally, Wind is the full version of the music played when the tamers decide to go to the digital world.
 * Finally twice, both the Latino dub of the Tamers opening theme and the german remix puts the English dub to complete and horrid shame.
 * The Japanese original, "The Biggest Dreamer". Its memorial theme is pretty damn cool too.
 * César Franco is the voice behind the Latino Dub of the Tamers opening theme. The full version, Sueña, Inventa (El Gran Soñador), is well-worth a listen.
 * As the Butterfly example above, there is also a very good fan made hard rock instrumental cover.
 * "One Vision" made several moments from Digimon Tamers incredibly awesome.
 * Pretty much any moment where the Ultimate/Mega Digimon appear is made instantly awesome by that song. It also helps that the 3 different Digimon get different renditions to start up. Gallantmon goes straight into the rock chorus of the song, MegaGargomon starts up with the rock riffs from the beginning, and Sakuyamon gets an entirely different theme (More Traditional Japanese sounding) before going into One Vision.
 * the German version is almost even more awesome for using the song's iconic badass guitar solo right at the beginning of the song.
 * It's not the first time that guitar solo appears. It's Dukemon's specific riff.
 * Also worthy of note is this fan-made guitar cover.
 * "EVO" and "Slash" pretty much gave Tamers its unique feeling.
 * Evo also had an awesome remix in the german dub.
 * Yuhi no Yakusoku. Is there such thing as a Crowning Music of Heartwarming?
 * The english dub has Promise.
 * What a about a Crowning Music of Tear Jerking ? You know what it is, Three Primary Colours.
 * What about the opposite side of Primary Colors, sung by the Digimon partners Issho ga ii ne.
 * Again The two heartwarming TV ending themes:
 * My Tomorrow, sung by AiM (Ai Maeda) and the memorial version, sung by the female characters' cast.
 * Days, by AiM (they just can't stop using her apparently)
 * Don't forget to mention the Tamers' drum and bass remix of the dub theme.
 * The Korean Opening

Frontier

 * The Hyper Spirit Evolution theme, "The Last Element".
 * The ending theme, "An Endless Tale".
 * "Yuuki o Uketsugu Kodomotachi e" is another memorial theme, this time for the end of Frontier, and featuring darn near everyone who ever recorded a theme song or battle theme for Digimon up to that point.
 * Wha? No "With the Will?
 * Then there's "The Last Element", which played in Frontier as the Hyper / Unified Spirit Evolution theme (in other words, for Emperorgreymon y Magnagarurumon), and during the birth of Susanoomon. The track which replaced it in the dub is just as good.
 * Koichi's theme, "Oreta Tsubasa de".
 * The most hilarious song ever in Digimon, Get the Biggest Fire, where the two main characters of Digimon Frontier try to sing a new theme, starting with the earlier themes. They sing very badly.
 * Frontier's opening sequence "Fire" is so fun and uplifting. The English opening is really catchy and powerful too, to say the least.

Savers

 * "Believer"
 * The second opening theme, "Hirari".
 * Chouhatsu Infinity, used whenever the series goes G Gundam.
 * The first opening, "Gou'ing! Going! My Soul!" is also awesome
 * The second ending theme, Ryuusei. The ending animation only reinforces it.
 * The entire flashback album, which includes:
 * An orchestral theme, which is triumphant like no other
 * Burst Mode. IT DOES NOT GET MORE EPIC THAN THIS
 * This instrumental danger music, Rainy Day.
 * The alternate, techno, burst mode theme.

Xros Wars

 * This series takes lots of inspiration from mecha animes such as Gao Gai Gar, and as such it brings loads of hot blooded music to the table with it! To begin with, We Are Xros Heart by the magnificent Kouji Wada continues the Digimon tradition of seriously kick-ass evolution themes. Also dubbed "the ending theme" by fans, since the show has no real ending credits, and this song has a tenancy of always showing up at the end of the episodes, usually during Crowning Moment's of Awesome.
 * The DigiXros-theme, which tends to play immediately before We Are Xros Heart, (this troper actually thought it was part of the song until he heard the full version) is quite cool too.
 * Kiriha gets his own theme music as well, complete with lyrics that describe his blazing blue flames perfectly, Blazing Blue Flare. Makes any moment of the series where he's kicking ass all the more awesome, usually always with Metal Greymon.
 * And just when you think you can't get any more awesome, Mr. Kouji Wada goes and gives us X4B The Guardian for ShoutmonX4B's appearance. Xros Wars seems to be giving its main Digimon their own themes.
 * Not just the good guys, but the evil Digimon get their own themes too! Dark Knightmon has Dark Knight ~Immortal Champion. With lyrics like KILL YOU in it, you just know it belongs to a magnificently evil bastard of a villain.
 * The pattern continues with Dancing Hero of the Skies! X5!, which sounds like something straight out of a Super Robot anime! (Complete with lyrics describing the transformation and abilities of Shoutmons new form!)
 * The opening theme, Never Give Up! while not by Koji Wada, is awesome in its own right, and even has its own Promotional Video (PV)
 * Now that evolution has been introduced, even more awesome songs are sure to follow, the first of which is Taiki's evolution theme, Evolution and DigiXros Ver. Taiki, perhaps the epitome of Hot Blood condensed into a single song, this brings Kouji Wada's songs for Xros Wars to four, which is his highest yet for a Digimon series, equal with Frontier. And he didn't even sing the Opening theme!
 * Speaking of the opening, Xros Wars changed OP's for its second arc, so behold New World, the first Digimon Opening sung by a female singer. Its chorus leaps straight into earworm territory.
 * Be impartial to the non lyrical music in the series as well! Fight for Victory plays in some pretty tense moments in the series!
 * Xros Wars, like all Digimon series, has a great OST. (It's just usually overshadowed by the even greater lyrical music.) Here we have Main theme - Piano Solo, Bonds of X4B, X5 Heavans, and there are loads more. Need I say more?
 * And with the arrival of Kiriha's evolution we get his new theme as well! Evolution and DigiXros Ver. Kiriha.
 * And if you thought they couldn't top what they already had, they give us We Are Xros Heart - ver. X7, sung by a seemingly impossible TRIO of Koji Wada, Takayoshi Tanimoto, and a returning Ayumi Miyazaki! Not to mention with this, Kouji Wada has sung a total of five (six if you count his small part in Kiriha's evolution theme) songs in Xros Wars, making it the most Kouji Wada songs in a single Digimon show!
 * Some clarification: Miyazaki Ayumi wrote the evolution songs Brave Heart, Break Up!, Beat Hit, and The Last Element. Takayoshi Tanimoto wrote the themes for DarkKnightmon and Kiriha and his original entry into the song base was the much-beloved One Vision. There. Now you may return to bask in the awesome.

Xros Wars: Young Hunters

 * "Tagiru Chikara" (which can translate to either "Tagiru's Power" or "Overflowing Power") is a serious contender for the rockingest song Digimon has produced. Besides being used during evolution-related moments of awesome, it's sung by Psychic Lover. Need we say more? You can find it right here.
 * "Shining Dreamers" is Yuu and Damemon's evolution theme. Shame it was so underutilized in the show proper, because it's really good.
 * "Legend Xros Wars" is an epic tribute to all the seasons of Digimon thus far, featuring references to all the theme songs in its lyrics. It's used in moments with all the heroes coming together, like the battle between all the leaders and Quartzmon's army of VenomMyotismon and MaloMyotismon. WE ARE LEGEND HEROES!, indeed.

Movies

 * Requiem from the first movie's finale. It may not be as fast-paced as most of the other songs here, but it easily matches them in sheer levels of awesome.
 * Not only did that song make Omnimon/Omegamon's first appearance truly epic, but it also made Imperialdramon Paladin Mode's appearance epic (That's movies 2 and 4). Also, in the strangest of places, the song was used for Mercurymon's opera style battle with Takuya (Digimon Frontier). Watching a main hero get beaten to death with this music only makes the scenes more awesome and symbolic.
 * From the Japanese Digimon Movies, Bokura no War Game and Friend Itsu Mademo Wasurenai, two rather unusual songs.
 * From Battle of Adventurers, the Tamers' first film, 5th overall, the wonderfull Moving on, makes the listener feel like he's in a platform game.
 * Remember X-Evolution? Apparently they have released a (very epic orchestra) soundtrack, of which we can only hear the opening and Dorumon sad, cue evolution.
 * The first dubbed movie (i.e. concatenation of the first three) is capped off by an oddly epic cover (by Len) of "Kids In America".
 * From the same movie comes Final Battle, which plays during the Final Battle.

Games
Note that most Digimon games have different soundtracks depending on whether it is the original Japanese version or an English translation; one of the most common changes is the removal of themes based on songs from the anime, though they never put equivalents from the dub in.


 * From Digimon World:
 * File City at night
 * Hard Wild Battle
 * Overdell Cemetary
 * Gear Savanna at night
 * Factorial Town at night
 * From Digimon Card Battle:
 * Wisemon's tower
 * From Digimon Adventure 02 D 1 Tamers:
 * The Moon=Milleniumon battle
 * From Digimon World 2:
 * Boss battle
 * Code Domain
 * Core Tower
 * Ancient Transport
 * Digital Nursery
 * Wild Battle
 * Chaos Tower
 * This remix of the boss duel theme. With an electric guitar, as well as some machinedramon dialogue
 * From Digimon World 3:
 * Leader Boss battle
 * Gunslinger
 * Bug Maze
 * Protocol Ruins
 * Legendary Gym
 * The saving screen. No, seriously.
 * Deeper Crevice
 * Online Center
 * Main Lobby
 * Genbu City
 * Asuka City
 * From Digimon World 4:
 * Mecha Rougue X (1º form)
 * Doom Dome
 * Dry Land
 * Humid Cave
 * From Digimon World DS:
 * Digivolution
 * From Digimon World Dawn Dusk
 * These two remixes of the battle themes, theme 1 and theme 2.
 * The Japanese version of Digimon Rumble Arena features instrumental covers of the Japanese openings and inserts up to that point (save The Biggest Dreamer, which was its opening theme in its original form). They're all fantastic, with Butter-fly expectedly being a standout.
 * An unlikely entry is Digimon Battle, a Korean MMO which has an epic battle theme, and an inspired title screen music.