RIM's BlackBerry music service won't be as aggressive as others but will be counting on a unique strategy and a lower price to get listeners involved. New leaks for the service, sometimes called BBM Music, suggest that each individual user's catalog will be capped at just 50 songs but rely on a BBM group to expand. In CrackBerry's understanding, anyone who's subscribed in the group also shares their library, giving access to hundreds or thousands of songs.