It tends to be disputed to some extent, but 1970 - the year of Black Sabbath's first release - is the most common answer.
1968.
Iron Maiden have always been a heavy metal band since they began in 1975
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Nu-metal, heavy metal, alternative metal, groove metal.
Heavy Metal with Christian imagery and lyrics.
The Production Budget for Heavy Metal was $9,300,000.
Heavy metal. Classic metal to start with, but recently they have gone more towards prog/power metal.
some people say they are heavy metal but I say they are screamo
do covers of heavy metal songs
What is a word for a heavy metal block
Heavy Metal Me was created on 2005-11-18.
Heavy Metal Funkason was created in 1998.