Sometimes Dubstep. Sometimes Opeth (progressive/melodic death metal, probably not for everyone). But my real silver bullet is the Symbols album by KMFDM.
Edit: And when I need to chill out more and concentrate, Indian classical music, particularly tabla stuff since I like percussion, is fantastic. I've also recently found that Herbie Hancock had a similar effect, (an album where he sounds more like conventional jazz.)
Edit: And when I need to chill out more and concentrate, Indian classical music, particularly tabla stuff since I like percussion, is fantastic. I've also recently found that Herbie Hancock had a similar effect, (an album where he sounds more like conventional jazz.)