In an early-'90s, and again in late 90's/ early 2000's, Spinal Tap tour, Michael McKean, Harry Shearer and Christopher Guest opened for themselves as The Folksmen and were booed during the first act, as people did not know or cared that the two bands had the same musicians.
The Folksmen was originally a sketch performed on Saturday Night Live (1975) during the 1984-85 season, when Christopher Guest and Harry Shearer were cast members and Michael McKean was the host.
The moaning woman heard through Mitch's (Eugene Levy's) hotel room wall was voiced by Christopher Guest.
The Folksmen are a parody of The Kingston Trio, right down to some of the album covers, the uniforms, and the way they perform their songs.