If you enable tagging with Advanced Relationships, you get these extra variables:
Variables will not be created if there was no value retrieved for the variable from the MusicBrainz database.
List of performance attributes for the work (e.g.: “live”, “cover”, “medley”). Use $inmulti to check for a specific type (i.e.:
$if($inmulti(%_performance_attributes%,medley), (Medley),)). (since Picard 1.3)
Recording disambiguation comment. (since Picard 0.15)
Recording title - normally the same as the Track title, but can be different.