It begins. Google’s cloud service for music is live for everyone at music.google.com/music, but not available for use, as you have to request an invite. Until the Google I/O 2011 keynote states what Google Music actually does, this is all you have to know about:
Music Beta is a new service from Google that gives you instant access to your personal music collection without the hassle of wires or syncing. Add your music collection and listen on the web or any compatible Android device.
Looks a lot like Amazon Cloud Player.
Update: It’s official. Google Music Beta will launch in the U.S. for now, only via invitation, or via Xoom and Google I/O attendees. The Music Beta is based in the cloud and allows you to stream up to 20,000 songs free by uploading them from your PC or Mac via an exportation app. Offline listening is available as well, as some songs can get cached for offline listening. The Music app is available for Android 2.2+ devices, including Android 3.0 to 3.1 Honeycomb tablets.