A band that started in the early 80's that possess, and probably created, several of the compulsory characteristics for playing metal. E.G. - long hair, skull paraphenalia, tight jeans (preferably ripped), at least two albums with 8 (minimum) or 9 (maximum)tracks but still under 50 minutes long.
RUST IN PEACE IS THE BEST OLD-SKOOL METAL ALBUM. nu-metal is gay.