Set list, mixtape site

I discovered this site this morning and haven't been able to get away from it.  I  love discovering new music and this seems to be a fun  resource.  Easy to use:  search by genres or set lists, then listen to a "mixtape" of surprisingly great music.  I've listened to "Murder Ballads"  (Lead Belly, the Blue Sky Boys recorded in '37, Big Bill Broonzy), tried the "Ska from the early 90's" which didn't just consist of Sublime and Reel Big Fish, and "Foreign Chart Toppers" so far. 

http://sets.songza.com/