This one's valid for mason as well; likely a ticket for nikki.

http://wiki.musicbrainz.org/User:BrianSchweitzer/ArrangerExtentionProposal passed in January 2008. There were some technical implementation issues ( http://bugs.musicbrainz.org/ticket/3564 ) but as we have other ARs doing similar things now, those issues don't seem to still exist.

The new AR is a release-artist and track-artist AR, essentially a clone of the "

{additionally} arranged {instrument on}" AR, except that it would be "{additionally}

arranged

{vocal on}

", using the vocal parts list instead of the instruments list.