List of bands (22):

Morbid Saint
Morningstar
Mortemia
Motionless In White
Motörhead
Moyra
Mr. Big
My Dying Bride
Myrath
Naked Root
NamoR
Narcotic Wasteland
Nazareth
Nefarious
Nenufar
Nervosa
Nestor
Nevertel
Newsted
Nickelback