Built by Henrik Berggren and David Kjelkerud, CitySounds provides "the latest" streaming music from "the most musically active cities in the world," and apparently the list of cities can change depending on their activity levels.
I don't know what they use to determine how musically active a city is, but based solely on content and design, this is pretty much the coolest thing I've found on the internets in a while. If you like electronic music, this is a goldmine.
via thrillist