[mb-users] Broadcast Commentary

I'm entering a recording of a live broadcast from the Metropolitan Opera
House...

http://musicbrainz.org/release/1fbfe882-4e0d-460f-ae50-3815c60a1ccc.html

...and the are a number of tracks listed as "Broadcast Commentary" which
contain the name of the announcer.  I'm stumped as to how I should enter
this into MB.  I could use a "performed" or "other vocal" A/R, but
neither of these seems quite right.  Converting the album to VA and
having the track artists switch between Giuseppe Verdi and the announcer
seems like an even worse solution though.  I'm open to suggestions.

David