Many workers find that the best music is somewhat ambient and randomly mixed, so it's not a conscious thing to keep track of, but a clever audio backdrop. CitySounds.fm provides quick streams of electronica-leaning tunes from around the globe.
CitySounds is simply a page with a number of city tags spread across it. Each city pick streams locally chosen, uploaded, or produced music using the SoundCloud platform, and pictures of each place are grabbed from Flickr. From a little exploration, the sounds tend to fall on the ambient side of electronica, which, like Gina's pick of the Groove Salad channel, feels well-suited to stream in the background during a productive work day. If the sounds get a bit too fashion-store-soundtrack-sounding for your taste, simply click another city and return to your tasks.
CitySounds.fm is free to use, no log-in required.