It says media-sound/rhythmbox:musicbrainz - support for muzicbrains but app-cdr/k3b:musicbrainz - Enable support for MusicBrainz audio lookups (musicbrainz.org) media-sound/amarok:musicbrainz - Enable support for MusicBrainz audio lookups (musicbrainz.org) media-sound/prokyon3:musicbrainz - Enable support for MusicBrainz audio lookups (musicbrainz.org) thats all. Trivial, hm?
fixed