Looking for music to practice martial arts to?

This questions a bit more odd than it sounds. I've already got fast paced, kickboxing, beat-the-tar-out-of-the-bag music. I'm looking for some slower, almost melodic songs to practice poomse's/forms to. Preferably instrumental music, but vocals can sound good as well. Right now I've got a couple songs by the XX and Port Blue (Adam Young) on there, but there's definitely room for expansion