I'm just bitter because I haven't received my beta invite yet. Actually I think it's going to be sixes either way.
We'll see. Right now I have 17,000 songs in Google Music, even old MP3s I've ripped from CDs. Don't have to worry about what's in the iTunes Store and what's not. Looking forward to it, but right now Google Music rocks for streaming at work, on Windows XP, and at home on my Mac.