A musicpiece from Mamoru Oshii's movie 'Mezame No Hakobune' a.k.a. 'Open Your Mind' a.k.a. 'Ark of Awakening'.
( めざめの方舟 (百禽~時を渡る)

My favourite choir! (The same choir that sung in Ghost In The Shell) )

This is from Keni Kawai's concert - 'Cinema Symphony' (2007).