List of bands (21):

Metal Church
Metal Factory
Metalite
Metallica
Michael Schenker
Michael Schenker Group
Ministry
Miscreance
Misfire
Monstrosity
Moonspell
Morbid Saint
Morningstar
Mortemia
Motionless In White
Motörhead
Moyra
Mr. Big
My Dying Bride
Myrath