The expression "heavy metal" is not serious and it is not agreed by IUPAC; a correct definition is not possible.
But traditionally metals with an atomic number greater than then 21 were considered as heavy.
Metal/Heavy Metal/ Rock
Heavy Metal
Heavy metal.
Heavy metal. Classic metal to start with, but recently they have gone more towards prog/power metal.
Heavy Metal/Rock Metal
Heavy metal
Heavy metal
Heavy Metal
It's an American heavy metal band.
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It's a type of heavy metal music that developed in the 1900's that combines grunge music, alternative metal, funk metal, hip hop, and various other heavy metal influences such as industrial, groove and thrash.
Iron Man by Black Sabbath is a heavy metal/doom metal track.