| Band | Genre |
|---|---|
| Metal Church | Heavy metal |
| Metallica | Thrash Metal |
| Michael Angelo Batio | Instrumental Rock |
| Michael Schenker | Hard Rock |
| Mike Orlando | Instrumental Rock |
| Ministry | Industrial Rock |
| Minor Threat | Punk Rock |
| Misfits | Punk Rock |
| Mob Rules | Power Metal |
| Morbid Angel | Black/Death Metal/Hardcore |
| Morifade | Power Metal |
| Mother's Army | Hard Rock |
| Motley Crue | Hard Rock |
| Motorhead | Heavy metal |
| Mr. Big | Hard Rock |
| Mudvayne | Nu Metal |
| Municipal Waste | Thrash Metal |
| Muse | Alternative Rock |
| Mushroomhead | Nu Metal |
| My Dying Bride | Gothic Metal |
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