Google Music will likely follow Spotify's lead in sharing music to friends via social network and other Google Music members.
Google Music's "Twist": You Can Share Songs : Read more
Google Music's "Twist": You Can Share Songs : Read more
They also claim that Google is paying huge up-front advances to record labels to gain the rights to share music. Most of the smaller indie labels are being left out of the picture because they don't have the resources to demand these kinds of advances like the major labels.