Could please someone tell me, what you actually use as “official” separator character for multiple MB artist ID in a ID3tag?
Example song: http://musicbrainz.org/recording/ed7f9237-98d3-4d91-bf66-f3acf7e73ce8
I talk about the “musicbrainz_artistid” or “TXXX:MusicBrainz Artist Id” according to this mapping table.
Should I use a comma, a Slash, a semicolon or something different?
Picard shows a Slash. But I’m not sure if this is for displaying only?
If you are using ID3 v2.3 (I assume that’s the case here) Picard will use the separator that can be configured in Options > Tags, and by default that’s a slash. It will also be displayed.
If you use ID3 v2.4 there is actually proper support for storing multiple values per tag. In this case Picard will show a semicolon (; ) as separator.
EDIT: I only realized after submitting my reply that this was a years old posting 
But it popped up in my inbox because the category was changed to “MusicBrainz Picard”, and I try to get all Picard issues to have at least some kind of answer 