>>5384828IOSYS is the composer? It's pretty banging tho. Will check out his works. As someone who plays music, the composition and arrangement is pretty fun to listen to and to play too.
Only musicians I know from Touhou circles are the Kishida Kyoudan & Akeboshi Rocket guys.
>>5384895What I love about it is that the song is such a perfect representation of Marine as a character too. Just one listen and you'll get a sense of how Marine is as a person.
Other holo original songs that I like is maybe GHOST, Shijoushugi Adtruck, and maybe Red.