I think it already IS ported. From the Rhythmbox developers' page (http://projects.gnome.org/rhythmbox/developers.html) under the building from source:
GNOME 3.0 or newer (including GLib 2.28 and GTK+ 3.2) -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to rhythmbox in Ubuntu. https://bugs.launchpad.net/bugs/977493 Title: Interface need to be ported ti GTK3+ Status in “rhythmbox” package in Ubuntu: New Bug description: Rhytmbox and other most used gnome programs needs to be ported to a full gtk3 interface, to be more compatible with the latest advantages of gtk3 theming like real transparent objects and more. at this moment I only know that gnome-system-monitor is up to date with this features. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/rhythmbox/+bug/977493/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
