Cool! Now I don't have to tag the artists for the festivals I'm going to by hand, which always felt a little redundant. (I still might though, since I synchronize the tags with my local library, and it's nice to play all the songs I have locally from a particular edition of a particular festival.)
Anyhoo, urls like (for lowlands 2008, which is going to be very good):
allow you to listen to a randomized stream of the entire lineup. A feature I have been rooting for for a long time. Last.fm, once again you come through.