musicbrainz/picard — pull request #103 by Sophist-UK (2013-05-22 12:09:06+00:00)
Title: Sophist handle performer tags id3v23

Performer tags are stored as part of the IPLS tag in ID3v2.3 and this is put into the TIPL tag when read by mutagen. This fix adds unknown TIPL roles as Performer tags.