http://musicbrainz.org/recording/3a243506-829f-4cf3-900f-85aee49701ab This recording should be credited to two artists, Wretch 32 and L, in line with the new featured artists guideline. However, the artist credit dialog, both in editing recordings and releases, won't do a search after entering 'L'. For the release, it was possible to work around this as the 'Add Missing Entities' tab picks up on the broken artist that hasn't been resolved and offers a list of possibilities. But with recordings it causes an Internal Server Error if an artist has not been matched to an entity in the DB.