On this release (https://musicbrainz.org/release/dce8460c-b2ed-42bd-97a5-5b9633d8d27a), it has the artists track A1 and B3 as “Various”. I know that that’s not meant for recordings, but I don’t know how else to write it. I don’t think writing out all the vocalists would work since that’s not what the original release lists it as
I’d be fine with all vocalists, honestly - it doesn’t seem like any of the tracks have more specific credits, and elsewhere it seems we are just using the performers who appear on the track?
Indeed on the actual packaging, tracks A1 and B3 are not credited differently than the others.
It’s just Discogs that didn’t use consistent crediting.
You can set the vocalists as track artist(s), for each track, as @reosarevok said.