I think there are probably other interesting ways of breaking out the visualization, but well done.
Hyper-local listening. By map.
find music in a city and s what artists are from what cities. use maps to see what artists live in that area or also type in a location. rdio, echo nest
The coolest visualization I've seen for this data so far. Helps give a feel of the local vibe.
Music based on geolocation.
Google Maps, Rdio, Echonest.