I prefer instrumentals. Peaceful sounding stuff, like the Final Fantasy Crystal Chronicles soundtrack. Specifically a few songs (Sleeping Treasure in the Sand, Something Burns in the Heart, Ice Mountain, Forest of Bygone Days) but I also like types of metal and progressive. I'll listen to anything good aside of Rnb, jazz, Jpop, and country. Some bands I like would be...
Apocalyptica, Dream Theater, Bullet For My Valentine, Soundgarden, Dethklok, the Strokes, The Gorillaz, Nine inch Nails, System of A Down, R.E.M, Blue Oyster Cult, and tons more.