Rhapsody for BlackBerry is now out of beta, and available for download. For $10 per month you can access 10 million songs on demand from the popular music service. The content will stream to your device over WiFi or 3G. You can also purchase songs from within the app for around a buck per track. As with most streaming music applications, you can also stream a wide variety of radio stations.
It's hard to say if the $10 per month is worth it, seeing as there are a lot of other streaming music services out there, with a wide range of prices. But, it is another option for you music lovers. You can download Rhapsody for most devices over at BlackBerry App World. You will need to signup for a subscription/free trial.