jfruhlinger writes with news that Research In Motion will soon jump into the music service market. The service will be available through BlackBerry Messenger, and will offer users 50 songs for $5/month, which they can then share with other people who own BlackBerries. "So why would anyone pay $5 a month to get 50 songs on their phone, when they can pay $10 a month and get an unlimited number of songs, that work on lots of different devices, from services like Rdio and Rhapsody? Reasonable question! But RIM seems to be assuming that its subscribers won’t ask. Instead it is playing up the notion that BBM Music will be about 'personalizing' your phone, in the same way that ringtones supposedly did a decade ago. Ringtones, as you’ll recall, let buyers play a few seconds of a song, and sold for a couple bucks, while full songs from Apple’s iTunes went for 99 cents. And for a few years, the music companies and the wireless carriers sold lots and lots of ringtones."