Nick Cave and Warren Ellis have collaborated on numerous soundtrack albums over more than a decade. In MusicBrainz all of these albums are credited to Nick Cave and Warren Ellis (as separate artists with a join phrase).
Recently I noticed that a single recording is credited to Nick Cave & Warren Ellis (a group), and I wanted to split the artist credit into two separate artists for consistency (https://musicbrainz.org/edit/76069966). Then I got a “No” vote from @brucey who said “Nick Cave & Warren Ellis” is an established collaboration, and that it’s the releases credited to Nick Cave and Warren Ellis as separate artists that should be corrected.
I was trying to find some guidelines about this, but I could only find https://musicbrainz.org/doc/How_to_Split_Artists with the advice:
Established bands (like Emerson, Lake and Palmer) shouldn’t be split; this is intended for short term collaborations that don’t merit their own artist page