The Cumberland Trio (not to be confused with The Cumberland Three) was a fine folk group formed at the University of Tennessee. I think they released a CD recently that was recorded 40 years ago, but had never been released before.
The Cumberland Three was mentioned earlier, but only named John Stewart(who quit the CT to join the Kingston Trio and went on to have a solo career), also had John (Monty) Montgomery, and Gil Robbins as members. Gil Robbins joined the Highwaymen after leaving the Cumberland Three. Gil is also father of Tim Robbins the movie star. Mike Settle also was a member of the Cumberland Three for a very short time. I think Mike Settle recorded one song with The Cumberland Three.
Bud