You don't need a repository. Since you're using Ubuntu 12.04, you already have what is called Rhythmbox 3 in the music plugin. I think you're confused because the version number of Rhythmbox says 2.9something, which is apparently because it's not 3.0 enough yet.
** Changed in: emesene (Ubuntu) Status: New => Fix Released -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1065793 Title: Music plugin (Listening to) clashed. Is this misconfiguration? To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/emesene/+bug/1065793/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs