Yes, it was Rhythmbox (the window title for Rhythmbox is just Music
Player).
$ apt-cache policy rhythmbox
rhythmbox:
Installed: 0.11.5-0ubuntu8
Candidate: 0.11.5-0ubuntu8
Version table:
*** 0.11.5-0ubuntu8 0
500 http://us.archive.ubuntu.com hardy-updates/main Packages
100 /var/lib/dpkg/status
0.11.5-0ubuntu6 0
500 http://us.archive.ubuntu.com hardy/main Packages
--
Music player starts in all user sessions
https://bugs.launchpad.net/bugs/242982
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