Presumably in physics there exists a kind of metal that does not fall into the heavy metal category, but in music it only means one narrow and everlasting thing.
Ice-T, Cool and Refreshing
The Yoko Influence
Alice Cooper
Melissa Etheridge
Wayne Newton
Wonderboom
Steve Martin
Eubie Blake … Ragtimes and Other Times
Reverend Horton Heat
Aaron Lewis
Pop Shots Jesse Hughes
Sting