I've forwarded that upstream:
http://bugzilla.gnome.org/show_bug.cgi?id=410744
** Changed in: rhythmbox (upstream)
Importance: Undecided => Unknown
Bugwatch: None => GNOME Bug Tracker #410744
Status: Unconfirmed => Unknown
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display cover art on artist / album selector
https://launchpad.net/bugs/86978