most of the bands you listed are more like hard rock than heavy metal.
what i (and most heavy fans) consider heavy metal is for sure not GnR or Mothley Crue. Its more like Blind Guardian, Helloween, Manowar, Iron Maiden, Savatage, Virgin Steele and the likes. THATS heavy metal. and it has never died. all those bands have a long history starting somewhere between 1975 and 1990 and constantly threw new albums on the market. just because they never had a real big media performance doesnt mean metal has died. its just that hardrock has vanished from the tv-stations and now we have a thing called nu-metal which is even worse.
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