While I'm working I like to listen to instrumental hip hop/trip hop, DJs like Degihuegi, Kognitif, Backini, and Guts are my favorite. Boogie Belgique is another huge favorite, they incorporate a lot of French/European melodies from the first half of the 20th century into modern beats and production techniques. Really interesting stuff.
While I'm home, it's usually nothin but the blues. Howlin' Wolf is my hands-down all-time favorite, with Paul Butterfield, Pre-Stevie Fleetwood Mac, Jimmy Rogers, and Canned Heat tied for second. Then there's Steppenwolf and the Grateful Dead of course, two favorites since middle school