Not necessarily a SATB quartet, it could be a TTBB quartet.
I’ve sung in both. Gosh, they were fun.
Anyway, anybody been in them?
I played in a number of bands, only one of which had four guys who could sing. Not exactly what you’re looking for, but on a song with four vocal parts it sounded awesome.
I’ve sung in lots of choirs and groups, including early music, doo wop and barbershop. Some have been quartets.
Yes, it is enormous fun.