I love my Beyerdynamic dt660 very much for classical music. I recommend that you read the following reviews by DavidMahler (thanks to him):
http://www.head-fi.org/t/559542/i-truly-believe-these-are-one-of-the-best-classical-music-headphones-ive-ever-heard
http://www.head-fi.org/t/634201/battle-of-the-flagships-58-headphones-compared-update-audeze-lcd-2-revision-2-6-4-13
http://www.head-fi.org/t/559542/i-truly-believe-these-are-one-of-the-best-classical-music-headphones-ive-ever-heard
http://www.head-fi.org/t/634201/battle-of-the-flagships-58-headphones-compared-update-audeze-lcd-2-revision-2-6-4-13