Classical Music ? (11/16 ep of The O.C.) Please help!

  1. Alright, so in Thursday's episode of the o.c. they played this amazing classical song during the very beginning of the episode, during Summer's therapy sessions. But the Fox site does not list the song in the music guide. Can anyone tell me what it's called or who composed it? I've attachted a link to the scene from Youtube. The song starts at 1 min 10 sec, and continues until 2:19. Thanks to anyone that can help!

    YouTube - The O.C. Season 4 - The Metamorphosis (Part 1)