- The Motor City Squares -- The Mountain of Attention Chant Guild
- The Mountain Park Old Time Band -- The Movers
- The Movers -- The Moving Violations
- The Mower Men -- The Muckle Sangs
- The Muckrakers -- The Muffs
- The Muggabears -- The Mullins Family
- The Multi-Colored Ties -- The Muppets
- The Mural and the Mint -- The Muses Rapt
- The Museum -- The Music Head Hunter
- The Music Improvisation Company -- The Musical Four Plus One
- The Musical Intimidators -- The Muskyteers (aka The Silvertones)
- The Muslims -- The M.U.T.S.
- The Muttering Guppies -- The Mutts