Facebook Music announced with Spotify, Rdio, MOG, and more
thisismynext.com
thisismynext.com
Now, Facebook has a customisable header (effectively) and integrated music playing. I'm not trying to suggest that the implementation is the same as MySpace's, but it's funny how these concepts come back around again in time.
I also travel frequently for work, and I like the idea of remotely listening to and chatting about music with my daughter, since it's something she might actually dig doing with me.
All that being said, I can't see this being an everyday activity.