All of the Len'en 4 themes (not counting credits, ending and title). This game one of the best OSTs i've heard for now, specially Mitori and Chouki's. But most of the OST is also pretty awesome. Decided to post this here since no one has done it yet.
None of this is mine, Len'en is made by JynX, they're awesome making games and their OSTs (BPoHC Golden Chapter will be a thing so...!!!)

Len'en 4 BPoHC Yago Ametsukana's Theme - The Road - Pounding Steel ~ Cyclops Tech

東方幕華祭 春雪篇 ～ Fantastic Danmaku Festival Part II

Touhou FDF Part II - Dance! Elegant Flower of Eternity

Touhou FDF Part II - Dance of the Crazed Sakura

Metales-que Catastrophe in Bhava-agra (Tenshi's Theme) by O-Life Japan

Touhou Lost Word BGM [ PARLOR TRICK ] 梶迫小道具店

Touhou Lost Word BGM [ カリスマ奪還 ] オーライフジャパン

Magical Evolve ~ DiGiTAL WiNG【東方ロストワードBGM】Touhou LostWord BGM

31 Love runs out

[Touhou] DBu - Gensokyo Millenium ~ History Of The Moon

The 8th track in ZUN's Legacy of Lunatic Kingdom

Touhou 15 - Legacy of Lunatic Kingdom

Touhou 15 LoLK - The Frozen Eternal Capital

Stage 4D Boss Theme from Touhou - Concealed the Conclusion, a fanmade Danmakufu game, the un-remixed track is originally from Perfect Cherry Blossom

CtC - Plastic Mind

Touhou FDF Part II - Dance of the Crazed Sakura

Vaurunelle