RIM is in the process of developing its own BlackBerry-themed music service with a unique tie-in, tipsters unearthed on Thursday. The company is believed to have at least one deal among the top four music labels and negotiating the rest. Its service would stand out through a connection through BlackBerry Messenger, though CNET couldn't get information as to how it would work; it would most likely take advantage of BBM sharing to spread tracks.