I've been entering a LOT of contra dance videos, nearly all of which credit both the band and the caller (the person who teaches the dance at the beginning, then calls out reminders to the dancers during the dance). I identify the caller by adding them with a Relationship of "vocals", subtype "spoken vocals", credited as "caller" (although sometimes I forget). It would be nice if I didn't have to type the "caller" part in manually, and it seems common enough to deserve a place in the Vocal tree, so I thought I'd make a ticket.

Examples:

https://musicbrainz.org/artist/142b89fb-d9e5-45f1-9366-f03eaa287a3b/relationships
https://musicbrainz.org/event/6d3f324e-426f-4d6d-84b5-6de59846ef65