For classical I like Bach symphonies.

But usually, I find myself incredibly productive when I listen to house music. My recent discovery has been Maceo Plex and the album "Life Index".

Maceo Plex merges the tracks into a continuous mix, roughly 128bpm, and once you skip track 1 (a dialogue), the music flows smoothly for a good 90 minutes.

Beyond that, I've always liked Kraftwerk's "Tour de France" for programming to.