Adam Corn May 15, 2010
I don't entirely expect this to be answered but let's give it a shot. The orchestra credited in Orchestral Game Concert 2 is the Tokyo Memorial Orchestra. Out of curiosity I googled for more info both in English and in Japanese (東京メモリアルオーケストラ) and came up with little more than, well, OGC2 references.
Was this a special orchestra that was commissioned just for the album? An older orchestra that was renamed or no longer exists?