The term used to label two musical genres.
1) The fusion of hardcore punk and thrash metal sounding exactly like the sound of it - Integrity or Converge are good examples
2) Extreme metal, usually simplified, with emo clean singing, screamo harsh vocals and an excess of breakdowns which sound nothing like hardcore punk. A fabricated genre aimed at making money and being popular. Why is this called "metalcore" is beyond me.
1) Integrity is a metalcore band and you know why when you listen to it. It takes thrash metal riffs and uses them on hardcore punk drum patterns or vice versa. You know where the "metal" part and the "-core" part came from.
2) Atreyu is a metalcore band. They sound more like nu-metal with chuggy breakdowns. However nobody took his time to understand what exactly the hardcore influences of theirs are - I can certainly hear no breakdowns in my hardcore punk
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