Well, it looks like BlackBerry's banking on another BBM to pull it out of the enterprise-only lurch, and this one should be like music to your ears. Earlier this week, we reported that RIM was readying a new music service, and now All Things D is giving us some juicy (unofficial) details on the tentatively titled BlackBerry Music. The publication says $5 a month will give users access to 50 songs that they can share with their BlackBerry-toting friends (also signed up for the service). What's more, it could be officially pumping the jams to the UK, US, and Canada as soon this fall, with other territories to follow in 2012. Rumor also has it that users won't be able to port the music to other devices, unless they happen to have a PlayBook handy. Somehow we suspect that last bit won't be what draws the youngster in.