It seems rather obvious that Soken isn't alone in provide the music, however after beating Thordian and watching the credits I came across a rather peculiar name: Kousuke Sato, I recognized the name and check to confirm that it is indeed the name of one of Konami's commissioned musicians, kors k. Why this thread you ask, because the placement of the name in the credits (he's listed as a flutist, which seems to be a little at odds with his works in the BEMANI games) as well as the possibility of someone else haring the name had me wanting to make sure if Square Enix actually managed to get kors k to help with Heavenward's soundtrack.