| The Majestic Twelve |
| The Majesticons |
| The Majors |
| The Makaha Sons |
| The Make-Up |
| The Malibus |
| The Mallards |
| The Maloy Brothers |
| The Mamas |
| The Mamas & The Papas |
| The Mamas & the Papas |
| The Mammals |
| The Man Eating Tree |
| The Management |
| The Mañana People |
| The Manatees |
| The Mancini Pops Orchestra |
| The Manfreds |
| The Manhattan Brothers |
| The Manhattan Skyline Quartet |
| The Manhattan Transfer |
| The Manhattans |
| The Manimals |
| The Manny Jazz All-Stars |
| The Manor |
| The Mantini Sisters |
| The Mantovani Orchestra |
| The Manvils |
| The Maple Blues Revue |
| The Maple Room |
| The Mar-Keys |
| The Maranatha! Kids |
| The Maranatha! Singers |
| The Marathons |
| The Marbles |
| The Marc Atkinson Trio |
| The Marcarlo Brothers |
| The Marcels |
| The March Divide |
| The Mariachi Brass |
| The Marías |
| The Mariners |
| The Mark Of Cain |
| The Marketts |
| The Marley Brothers |
| The Marlin Sisters |
| The Marmozets |
| The Maroons |
| The Marphoi Project |
| The Married Monk |
| The Mars Volta |
| The Marshall Tucker Band |
| The Martinis |
| The Martins |
| The Marty Paich Dek-Tette |
| The Marty Paich Orchestra |
| The Marty Warburton Band |
| The Marvelettes |
| The Marvelows |
| The Marx Brothers |
| The Mary Jane Girls |
| The Mary Nixons |
| The Mary Onettes |
| The Mash |
| The Masked Marauders |
| The Masked Marvel |
| The Masqueraders |
| The Mass Missile |
| The Masters Apprentices |
| The Masters of Music Big Band |
| The Mastersons |
| The Mastersounds |
| The Masticators |
| The Matches |
| The Material |
| The Matrix |
| The Matrix |
| The Matt Catingub Big Band |
| The Mattson 2 |
| The Matty Malneck Orchestra |
| The Matty Matlock Orchestra |
| The Mau Mau Chaplains |
| The Maudlin Fee |
| The Mauna Malahini Islanders |
| The Mavericks |
| The Mavis's |
| The Mawb |
| The Max |
| The Maxes |
| The Maxx |
| The Mayan Factor |
| The Mayfield Four |
| The Mayflies USA |
| The Maynard Brothers Band |
| The Maynard Ferguson Big Band |
| The Maytals |
| The McAuley Boys |
| The McCalmans |
| The McClain Sisters |
| The Mcclurg Family Singers |
