Listening to music can make you smarter! Mathematics and music are intrinsically linked through keeping time and harmonics. Ties have also been made to learning new languages, spatial-reasoning and relating to others. What music gets your brain juices flowing?
I listen to Earfood, by Roy Hargrove Quintet, and I also like just about anything by Calexico. The problem is, although my brain juices start flowing, I get distracted by the music, so sadly I usually work in silence.
Miles Davis' "Sketches of Spain" opens that little valve in my brain and so does Amadeus!