Dang, if batoto wasn't closing I would've posted a heck ton of touhou music in here 4 or 5 years ago.
I think posted quite a bit with manga2x back in 2012 in "Listen to the Song Above" or "What's the last song you listened to?". SOUND HOLIC IS DEFINITELY GOOD STUFF! Along side with IOSYS and Cool&Create, they are such classic!
For you OMGWTFBBQPONIES, I would list my favourite Comiket circles for touhou (in no particular order):
- WAVE
- AQUA STYLE
- Sensitive Heart
- TAMUSIC
- Foxtail-Grass Studio
- 狐の工作室
- うんちく商事 Unchiku Company
- 東京アクティブNEETs / Tokyo active NEETs
- 趣味工房にんじんわいん Hobby Atelier Carrot Wine
- 彩音 ~xi-on~
- sound sepher
- FELT
- DDBY
- ShibayanRecords
- Marasy
- K-wave LAB
- izmizm
- XL Project
- 幽閉サテライト Yuuhei Satellite
I've got loads more but I'll leave it for now. As for individual songs, there are quite a bit to go through.