hmm, i'll try
Accept, Armored Saint, Anthrax
Black Sabbath, Burzum
Carcass, Alice Cooper
Death, Dio, Darkthrone
Electric Wizard
Finntroll
Green Jellÿ
Helloween
Iron Maiden, Iced Earth
Jackyl
Kr'uppt (once local band, somehow i have their album)
Led Zeppelin (to some extent)
Metal Church, Morbid Angel
Opeth (to some extent)
Queensrÿche
Rainbow
Strapping Young Lad, Saxon, Sodom
Townsend, Devin
UFO
Cant think of any for N,P, and V-Z at the moment
and im leaving out a lot of bands for some of the letters...need to go look at my album collection