Thanks for your reply.
Here is the backtrace produced by gdb with rhythmbox-dbgsym installed.
Please let me know if you need anything else.
** Attachment added: backtrace
http://launchpadlibrarian.net/9864135/gdb-rhythmbox2.txt
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rhythmbox crashes in Feisty while playing certain mp3
Thanks for your bug report. Please try to obtain a backtrace
http://wiki.ubuntu.com/DebuggingProgramCrash and attach the file to the
bug report. This will greatly help us in tracking down your problem.
** Changed in: rhythmbox (Ubuntu)
Importance: Undecided = Medium
Assignee: (unassigned)