Question: Ehnahre is a ensemble of a music subgenre that has developed since the early what?
Sentence (from "Extreme metal"): With the exception of doom metal, all of these genres are characterized by fast tempos, attesting to their roots in hardcore punk, which has also fused with extreme metal in the forms of crossover thrash, crust punk, grindcore, sludge metal and metalcore.
Relevant evidence: No