Anyone who wants to take part in the Steam Music beta can the community group; of the group will receive invites in waves. After pointing Steam to the directory that houses your computer's music collection, you'll be able to navigate a display of songs, albums and artists directly from the in-game Steam overlay. For me, a big perk for this type of integration would be managing volume levels without having to alt+tab out to iTunes.
Valve promises that the future of in-game music integration will be based on beta , so participation counts. Head over to the community group , where pleas for integration with streaming music services like Last.fm and Pandora have already begun.
