This is neat! It gets a bit too cluttered when I'm just trying to look at new artists though, maybe make a click listen to the artist, but maybe double click to 'expand' them? Good stuff either way!
Seconded (on all counts). This is a really huge UI improvement to be able to see genre tag and quickly hear a sample. I like
eatwater123's idea of double click to expand, or perhaps just give the option to unexpand a node?