Just got my invite to Google Music Beta, things I have learned so far:
-Can upload up to 20,000 songs
-Can ask the music from any computer (limit 8)
-Updated Android Music app allows streaming of my music and 'extra'
-Access to additional music of my choice
-Price - Currently free but it has been stated that a price will be added after it leaves beta
Currently my phone is still syncing with my account, at 150+ songs, and as each album is completed more choices are presented for me to try. I also got the option to select certain genres of music I wanted to have recommendations from, such as Classical, Rock, Hip-Hop, Pop, Country, etc.
Picture of the home page:
