- The Maplestar Classic -- The Marbles
- The Marc Atkinson Trio -- The Marcia Blaine School for Girls
- The Marcus Johnson Project -- The Mariettas
- The Marigold Circus -- The Maritime Jazz Orchestra
- The Marius Band -- The Mark Pfau Project
- The Mark Poniatowski Situation -- The Marlans
- The Marlboro Man -- The Marsadees
- The Marsalis Family -- The Martian
- The Martian Denny Orchestra -- The Martinis
- The Martinis -- The Marvins
- The Marx Brothers -- The Mascots
- The Mascots -- The Masonics
- The Masons -- The Mass