Well - even though the current RB source in ubuntu has a build-dep on libmusicbrainz3-dev, support doesn't get enabled. So I guess that that answers why no support. Would be nice if it could retrieve the cdinfo somehow. from LP build logs
configure: Rhythmbox was configured with the following options: configure: ** Tree database is enabled configure: ** Multimedia keys support is enabled configure: MusicBrainz support is disabledconfigure: Rhythmbox was configured with the following options: -- 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/815585 Title: Rhythmbox unable to retrieve CD title / track information from MusicBrainz Status in “rhythmbox” package in Ubuntu: Confirmed Bug description: Inserting any audio CD, even ones previously recognised, results in a message : "Could not find this album on Music Brainz". No album or track title information is retrieved. The CD is shown in the left hand panel under Devices as "Unknown Audio". This now happens for every CD inserted. Not sure if this helps, but Banshee shows the same problem, displaying a message stating "Could not fetch metadata for CD" ProblemType: Bug DistroRelease: Ubuntu 10.10 Package: rhythmbox 0.13.1-0ubuntu6.1 ProcVersionSignature: Ubuntu 2.6.35-30.54-generic 2.6.35.13 Uname: Linux 2.6.35-30-generic x86_64 NonfreeKernelModules: fglrx Architecture: amd64 Date: Sun Jul 24 22:30:57 2011 ExecutablePath: /usr/bin/rhythmbox InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Release amd64 (20101007) ProcEnviron: PATH=(custom, user) LANG=en_GB.utf8 SHELL=/bin/bash SourcePackage: rhythmbox To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/rhythmbox/+bug/815585/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : [email protected] Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp

