Quite a few really. Answers, Equilibrium and The Warrens just to repeat what's already been said.

Also adore Footsteps in the Snow, Thunder Rolls, Fiend, Mobius and Rise, The Hand That Gives The Rose, Heavensward, Voidal Manifest, Tempest, Ultima and... I forget the name of the casual Shadows of Mhach theme, but it's very soothing too.

Oh, and of course A Bloody Reunion.