Kishida Kyoudan and the Akeboshi Rockets (岸田教団&The明星ロケッツ), also known as Studio k2.
A doujin Rockband, famous amongst Touhou fans for their Touhou arranges and Flowering Night concert participations.
They also do some original stuff like on their album 星空ロジック〜Starry Sky Logic〜.
http://uk.youtube.com/watch?v=wLDR-x0RoGM