History Music / CosMo

* MultipleEndings: ''Demise'' is the "Worst End", ''Disappearance'' is the "Dead End" (and ''Hyper∞lation'' is its sequel), ''∞'' is the "True End", and ''Intense Song'' is the "INFiNTY Happy End".

** The ''VideoGame/HatsuneMikuProjectDIVA'' games ''love'' setting cosMo songs as these. The first game kicked it off with ''The Disappearance of Hatsune Miku'' as its FinalBoss. Then its sister song ''The Intense Voice of Hatsune Miku'' ejected ''Disappearance'' from its position in the second game and its UpdatedRerelease ([[NintendoHard and this version of the song remains one of the hardest songs in the series]]). ''F'' threw in the original song ''Sadistic.Music∞Factory'' as its FinalBoss. ''F 2nd'' finally broke the trend by [[{{Nerf}} nerfing]] ''Intense Voice'' and setting the FinalBoss to ''Two-Dimensional Dream Fever''.

[=cosMo=], also called Bousou-P after one of his more popular works, is an animator and prominent {{Vocaloid}} composer. He has become famous in the {{Vocaloid}} community for producing a vast number of extremely fast-tempo songs (often over 200 bpm), pushing the software to its limits. He has composed music sung by Hatsune Miku, Kagamine Rin and Len, Megurine Luka, Gumi, and Gakupo; while most of [=cosMo=]'s works are Miku songs, he claims that his favorite Vocaloid is Kagamine Len.

[=cosMo=] has produced two series--the ''Fantastic Garden'' series, and ''The Disappearance of Hatsune Miku,'' which is responsible for his leap to fame. He has produced a number of mini-albums, and his songs are often included in Miku compilation [=CDs=]. ''Fantastic Garden'' is known for being extremely surrealist, and ''The Disappearance of Hatsune Miku'' chronicles the experience of what life is like for an actual Vocaloid program with a merciless eye. The ''Disappearance'' series, along with a few new songs, has been released as a full-length CD which will also be [=cosMo=]'s major debut.

** ''The Disappearance of Hatsune Miku'' in several of the ''VideoGame/HatsuneMikuProjectDIVA'' games.

* Hyperinflation

* [[VideOGame/SoundVoltex For UltraPlayers]]

* [[VideoGame/SoundVoltexBooth Evans VolteX Pf arrange]] (remix)
* [[VideoGame/SoundVoltexBooth neu BSP style]] (remix)

In addition to Vocaloid songs, [=cosMo=] also produces songs for several Franchise/{{BEMANI}} series, including ''VideoGame/SoundVoltex'' and ''VideOGame/{{beatmania}} IIDX''. While he does produce some BEMANI songs featuring Vocaloids, some of his other songs are completely orignial works with no Vocaloids, most notably "For [=UltraPlayers=]", which was used for the final round of the ''Sound Voltex'' tournament at Konami Arcade Championship 2013 and is one of the hardest songs in the entire game.

In addition to Vocaloid songs, [=cosMo=] also produces songs for the doujinshi-centric ''VideoGame/SoundVoltex'' series, and has made a few remixes of Music/{{BEMANI}} songs.

In addition to Vocaloid songs, [=cosMo=] also produces songs for the doujinshi-centric ''VideoGame/SoundVoltex'' series.

** ''For [=UltraPlayers=]'' was one of the final sound songs in the ''Sound Voltex II'' section of Konami Arcade Championship 2013. Furthermore, while the series' difficulty to that point peaked at level 15, it was one of the first two songs to have a chart rated a '''16'''.

* MismatchedEyes: Rho and Lambda from ''ANTI THE ∞HOLIC'' and the ''Star Girl'' series.

* Evans VolteX Pf arrange (remix)
* neu BSP style (remix)

!Other songs and covers:

* LuckyCharmsTitle: Hyper∞lation, Capsule.

* MindScrew: Fans are already whacking their brains out which came first: ''Radio Girl and the Fantastic Garden'', or the Fantastic Garden series. Or that either are just very coincidentally the same. Or that it's a result of [[CanonWelding cosMo simply wanting to]] [[{{Troll}} screw with us]].

* The Runaway Boy and the Lost Girl (Gumi)
* The Nun and the Idol (Miku)
* The Innocent Girl and the Grown-Up World (Gumi)

* Dr. Realist (Gakupo)
* The Adventurer Girl and the Playground of Eden (Miku)
* The Imaginative Girl and the Fantastic Garden (Miku)
* The Transfer Girl and the Transmigrated Boy (Rin and Len)

* {{Gayngst}}: The protagonist of ''Transfer Girl''.

* CanonWelding: In one of the bad endings Miku imagines to ''Disappearance'', she winds up in the Fantastic Garden. The writer in ''Fantastic Garden,'' who originally had a cameo in ''Runaway Boy,'' turns out to be another real resident of Stella. Stella herself was the singer of a one-shot song, but then popped up again in the Star Girl series.

!The ''Dr. Realist'' series includes:

* Runaway Boy and the Lost Girl (Gumi)

* Dr. Realist (Gakupo)

* Adventure Girl and Game of Miniature Garden (Miku)
* Electric Wave Girl and the Fantasic Garden (Miku)

* CanonWelding

* DrivenToSuicide: The end of [[spoiler:Runaway Boy and the Lost Girl]]

* DeathByCameo: Runaway Boy and the Lost Girl features short cameos by the Fantastic Garden writer, Rin and Len from Atriesta, the girl from R-18, and Lucy (the little girl from Capsule). Lucy is sitting on top of a skyscraper. She's so enamored by her drug-induced hallucinations that she falls off.

* [[TearJerker The Disappearance of Hatsune Miku]]

* NightmareFuel: ''Hyper∞lation'' and ''Demise''.

* TearJerker: ''Disappearance'', especially the song itself.

* [[NightmareFuel The Demise of Hatsune Miku]]

* [[HighOctaneNightmareFuel Hyperinflation]]

* The Innocent Girl and the Grown-Up World (not yet released)

* ShoutOut: ''The Rampage of Kagamine Len'' starts with Rin enthusiastically shouting, "Let's play with Kagmaine Len!", a reference to ''Let's Play with Hatsune Miku''.