So, like RiderNet and AutoLog?One of the cool features of Rock Band Blitz is the "Recommended" feed. This screen greets you every time you load up the game, and is a fresh feed of recommended songs each time you start it up. This will suggest challenges for you to send to a friend, show you songs that are new to the Music Store, taunt you with songs your friends are beating you on, etc. One of the cool things it'll also do is prompt you to play songs you haven't posted any scores on. In effect, the game knows which songs you own that you might have forgotten you own!
Also, Random Song is currently an option in the game's song list as well.