| Band | Years | Genre | | Band | Years | Genre |
| M2M (14) | 1998 - 2002 | Pop | | Midnight Syndicate (8) | | Goth Rock |
| Ma Rainey (6) | | | | Mighty Lemon Drops, The (4) | | |
| Machine Head (8) | | | | Mighty Mighty Bosstones (18) | | |
| Mack 10 (3) | | | | Mighty Wah!, The (4) | | |
| Mackay, Andy (2) | | | | Mighty Wah, The (0) | | |
| Mad Caddies (9) | 1997 - | Ska | | Mikaila (5) | | |
| Mad Capsule Markets (3) | 1991 - | Progressive Rock | | Mike and the Mechanics (6) | | |
| Mad Season (2) | 1995 - 1995 | Rock | | Mike Farley Band (4) | | |
| Madness (18) | 1978 - 1986 | Rock | | Milk Incorporated (4) | | |
| Madredeus (4) | | | | Millencolin (92) | Oct 1992 - | Punk |
| Magellan (3) | | | | Milli Vanilli (2) | | Pop |
| Magic Bullet Theory (1) | | | | Mills Brothers, The (7) | | Vocal Harmony |
| Magnetic Fields, The (10) | 1990 - | Indie Rock | | Milltown Brothers (3) | | Madchester |
| Magnetophone (3) | | | | Mimic (2) | | |
| Mahogany Rush (1) | | | | Mindless Self Indulgence (9) | | |
| Makers, The (3) | | | | Ministry (9) | | |
| Malaysian Philharmonic Orchestra (11) | 1998 - | Orchestral Big Band | | Mink (5) | | Punk |
| Malcolm & Alwyn (0) | | Contemporary Christian | | Minmae (1) | | |
| Malevolent Creation (2) | | Death Metal | | Minor Threat (8) | | |
| Malibu Storm (1) | | | | Mint Condition (4) | | |
| Mamas and the Papas, The (13) | 1964 - 1972 | Pop | | Mint Royale (5) | | |
| Man (5) | 1968 - | Rock | | Minus 5, The (3) | | |
| Man in Gray (1) | | | | Minutemen (2) | | |
| Man or Astro-Man? (6) | | | | Miracle Legion (1) | | |
| Mandrill (1) | | | | Miracles, The (6) | | |
| Manhattan Transfer, The (3) | Oct 1972 - | Vocalese | | Misfits (21) | | |
| Manic Street Preachers (105) | 1980s - | Alternative Rock | | Misia (4) | | |
| Manilla Road (1) | | | | Miss Radio (4) | 1994 - | Alternative Folk |
| Mannheim Steamroller (6) | | | | Missing Man Formation (3) | | |
| Mano Negra (2) | 1986 - | Rock | | Missing Persons (4) | | |
| Manowar (25) | 1981 - | Heavy Metal | | Mission, The (11) | | |
| Manson, Marilyn (207) | 1989 - | Industrial Rock | | Mista Brizz (2) | | |
| Mansun (12) | | | | MMW (8) | | |
| Mantra (2) | | | | Mock Turtles, The (2) | | Madchester |
| Maow (2) | | | | Modern English (4) | | |
| Marais and Miranda (2) | 1941 - | Folk | | Modern Jazz Quartet, The (11) | | |
| March, April (3) | | | | Modern Lovers (4) | | |
| Marcy Playground (11) | | | | Modern Talking (14) | | |
| Marduk (2) | | Black Metal | | Modest Mouse (17) | 1993 - | Alternative Rock |
| Marie, Ashley (4) | | | | Modjo (2) | | Electronica |
| Marillion (10) | | | | Mods, The (2) | 1963 - 1970 | Garage Rock |
| Marilyn Manson (207) | 1989 - | Industrial Rock | | moe. (6) | | |
| Marine Research (7) | | | | Moffatts (70) | | |
| Marino, Frank and Mahogany Rush (1) | | | | Mogwai (36) | 1996 - | Rock |
| Marky Mark and the Funky Bunch (0) | | | | Moist (22) | | Alternative Rock |
| Marley, Ziggy and the Melody Makers (4) | | | | Mojave 3 (4) | | Indie Rock |
| Maroon 5 (15) | | Alternative Rock | | Molly Hatchet (7) | | |
| Marr, Johnny + the Healers (51) | 1998 - | Rock | | Moloko (8) | 1993 - | Electronica |
| MARRS (1) | | Hip-Hop | | Momus (9) | | Shibuya-Kei |
| Marry Me Jane (3) | | | | Monaco (2) | | Rock |
| Marshall Dyllon (2) | | | | Moneen (2) | | Punk |
| Marshall Tucker Band (1) | | | | Money Mark (4) | | |
| Martha and the Vandellas (1) | | Motown | | Monica (20) | | |
| Martika (8) | | | | Monkees (143) | | Pop |
| Marvelous 3 (5) | | | | Monkeywrench, The (2) | | |
| Masai (4) | | | | Monks, The (4) | | |
| Mason Proffit (6) | 1969 - 1974 | Country-Rock | | Mono (8) | | |
| Mass Hystereo (1) | 1997 - | Techno | | Monster (2) | | |
| Massive Attack (28) | 1987 - | Electronica | | Monster Magnet (6) | | |
| Master's Hammer (2) | c. mid-1980s - | Black Metal | | Montgomery Gentry (9) | | Country |
| Master P (8) | | | | Monty Python's Flying Circus (24) | 1969 - 1974 | Comedy |
| Masters at Work (5) | | House | | Moody Blues, The (73) | 1964 - | British Invasion |
| Matchbox Twenty (38) | | Rock | | Moon Seven Times (2) | | Rock |
| Matmos (3) | | | | Moonbabies (3) | | |
| Matthew Good Band (18) | | | | Moondog (10) | | |
| Mavericks, The (4) | | | | Moonglows, The (3) | | |
| Max (1) | | | | Moonlighters, The (4) | 1951 - | Rhythm and Blues |
| Max Creek (2) | | | | Moonspell (5) | | |
| Maxwell (46) | | | | Moose (2) | | |
| Mayfair Laundry (3) | 1996 - 2000 | Pop | | Morbid Angel (4) | | |
| Mayhem (3) | | | | Morcheeba (28) | | |
| Maytals, The (5) | 1966 - | Ska | | Mordred (3) | | Heavy Metal |
| Mayte (7) | | | | Morning Musume (10) | | |
| Mazer Rackham (4) | 1999 - | Folk | | Morphine (10) | 1989 - 1999 | Alternative Rock |
| Mazzy Star (6) | | | | Morrison, Jim and the Doors (59) | 1965 - | Classic Rock |
| MC Lyte (2) | | | | Mortician (4) | | Heavy Metal |
| MC Ren (8) | | | | Mosca De Bar (2) | | |
| McCain, Edwin (19) | 1990 - | Rock | | Mostly Autumn (11) | | Progressive Rock |
| McFly (4) | | | | Motards, The (4) | - 1998 | Garage Rock |
| McGee, Pat (4) | 1996 - | Pop | | Motels, The (2) | | Pop |
| McGuinn, Clark and Hillman (1) | 1977 - 1981 | Rock | | Mother Love Bone (1) | 1988 - 1990 | Glam Rock |
| McMaster and James (9) | | | | Mother Mercy (2) | | Hair Metal |
| MDO (6) | | | | Mothers, The (1) | | |
| Me First and the Gimme Gimmes (4) | | Punk | | Mothers of Invention (1) | | |
| Meat Beat Manifesto (3) | | | | Motley Crue (19) | | |
| Meat Puppets (6) | | | | Motorbaby (6) | | |
| Medeski Martin and Wood (8) | | | | Motorhead (15) | | |
| Meek, The (1) | | | | Motorpsycho (2) | 1989 - | Rock |
| Megadeth (37) | 1983 - 2002 | Heavy Metal | | Mott the Hoople (9) | 1969 - 1976 | Rock |
| Meja (3) | | | | Mountain Goats, The (4) | | |
| Mekons (2) | | | | Mountain Mirrors (1) | | |
| Melanie (11) | | | | Mourning Widows (10) | 1999 - | Hard Rock |
| Melt-Banana (3) | | | | Moxy Früvous (11) | | |
| Melvins (13) | | | | Mr. Big (15) | | |
| Men at Work (17) | 1979 - 1985 | | | Mr. Bungle (15) | 1985 - | |
| Men They Couldn't Hang, The (4) | | Alternative Rock | | Mr. Mister (1) | 1982 - 1990 | Pop |
| Men Without Hats (9) | 1980 - 1991 | New Wave | | Mr. T Experience, The (5) | | |
| Menlo Park (3) | | | | Mt. Mushroom (2) | | Pop |
| Menswear (2) | | | | Muddy Waters (9) | | |
| Mental as Anything (6) | 1976 - | Rock | | Mudhoney (8) | | |
| Mentors, The (4) | | | | Mudvayne (18) | 1996 - | |
| Menudo (6) | | | | Muffs, The (2) | | |
| Mephisto Walz (2) | | | | Mukesh (4) | | |
| Mercury Rev (4) | | | | Mungo Jerry (4) | | |
| Mercyful Fate (2) | | | | Murder City Devils, The (5) | | |
| Merlin (3) | | | | Murderdolls (5) | 1995 - | Thrash |
| Merzbow (12) | | | | Murmurs, The (2) | | |
| Mesh (3) | | | | Murphy, Gandalf and the Slambovian Circus of Dreams (3) | | |
| Mest (3) | | | | Muse (142) | 1994 - | Progressive Rock |
| Metal Church (3) | | Heavy Metal | | Mushroomhead (2) | | Heavy Metal |
| MetaliuM (3) | | | | Music, The (3) | | |
| Metallica (201) | 1982 - | Heavy Metal | | Muslimgauze (5) | | |
| Meters, The (4) | | | | Mutton Birds, The (4) | | |
| Method Man (11) | | | | MxPx (17) | | Ska |
| Methods of Mayhem (7) | | | | My Bloody Valentine (22) | | |
| Mew (2) | | | | My Dying Bride (11) | | |
| Mexican Pets (4) | 1991 - | Rock | | My Life Story (6) | | |
| Michael Stanley Band, The (0) | | | | My Life With The Thrill Kill Kult (14) | | |
| Michal (7) | | | | My Vitriol (7) | | |
| Mick Thomas and the Sure Thing (4) | 1999 - | Folk | | My Voilent Ego (1) | | |
| Mickey Hart Band (23) | | | | MyNis (4) | | |
| Midnight Justice Band, The (2) | | | | Mytown (6) | | |
| Midnight Oil (6) | 1976 - | Rock | |
