Could you attach gdb to that process to see why it's using alot of cpu?
it's probably hanged, please read
https://wiki.ubuntu.com/Backtrace#Already%20running%20programs
** Changed in: rhythmbox (Ubuntu)
Status: New => Incomplete
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rhythmbox-metadata process uses 100% cpu, even after closing app
https://bugs.launchpad.net/bugs/291813
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