Spotify (finally) launched today (7/14) in the U.S. with three different options for users. The first is a free version called "Spotify Free" which requires an invitation to join. I requested an invitation and am awaiting a response. Once you get in users can listen to music on their computers, but not mobile devices, and there will be advertisements integrated into the program. The second version is a $5 a month subscription plan which allows users to listen on their computers with no advertisements. And the third and final version is a $10 a month subscription plan that allows users to listen to high quality music on their computers and mobile phones, also with no advertisements.
For more info: see http://venturebeat.com/2011/07/14/spotify-launches-in-u-s-users-can-wait-for-invite-or-pay-to-get-inside/