“Skylight” by Gramatik. The title of this album, Beatz & Pieces, Vol. 1, pretty much sums up my taste in “working music”—heavy beat, probably some mixing / sampling or something that sounds like it, brought together by great composition.
“Imagination” by CFCF. A little less electronic, slightly more jazzy than some of the other stuff on this list, but still has that solid underlying rhythm layered with the more complex melodic stuff on top.
“Ce matin-la” by Air. Just relaxing, easy instrumentals. Nice changes of pace, combination of a bunch of different instruments ... working gold.