Blackberry maker Research in Motion is aiming to give itself an edge in the smartphone market with a new music service designed to run on its instant messaging system. The new service, to be called BBM Music, will allow users to access and share up to 50 songs at a time through their smartphones, and could be launched as soon as next week, sources tell the Wall Street Journal. RIM has signed a deal with at least one of the four major record companies and is closing in on deals with two more, according to CNET. (More Research In Motion stories.)