Similar Music Visualization: Compare Artists and Genres

I've been working on a backend web service data harvester for several months. Now that it's ready I put together a Constellation visualization as quickly as I could. And here it is!

This radial tree visualization shows music artists in red and user-created tags in green. For the most part the tags are genres but there are some other common tags like "seen live." Lines between artists mean they are similar according to Last.FM. The thicker the line, the higher the similarity score.

Click on any non-bold node to visualize the data in the context of that node.

Expect updates here, since there're quite a few things I'd like to do to improve this visualization. I'm thinking an artist search box would probably be a good start. (-;