This is the first version of Ubuntu to ship with [GrooveBasin](https://github.com/andrewrk/groovebasin), a music player server I've been working on for 4.5 years.
I look forward to trying it! RhythmBox is okay, but there's something about the window behavior that bothers me - IIRC the application still plays in the background when I hit the close button, it always throws me off.