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.
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
Often associated with the nu hardcore and fashioncore scenes.
New school metalcore: Bullet For My Valentine, As I Lay Dying, All That Remains
Bad metalcore: Bring me the Horizon, Of Mice and Men, Asking Alexandria, The Black Dahlia Murder, Chelsea Grin, ect.
Real Metalcore bands: Underoath (Only there first 2 albums) All That Remains, Avenged Sevenfold (Only there first 2 albums), As I Lay Dying, August Burns Red, Killswitch Engaged.
Fake Metalcore Bands: Underoath (Everything else they made after Cries of The Past), Motionless in White, Attack Attack!, Asking Alexandria
Metalcore haiter: Beacuse metalcore bands like Asking Alexandria sounds like emos trying to play metal!
Me: (facepalms) Asking Alexandria is NOT metalcore!
Metalcore haiter: Yes they are, it says so on Wikipedia.
Me: (Facepalms again) No they aren't, they are only called so because they have breakdowns in there songs and have screamed vocals. Listen to August Burns Red for an example of what REAL metalcore is!
(All of August Burns Red's discography and some of All That Remains songs later)
Metalcore lover (Formally a metalcore haiter): August Burns Red is the BEST BAND EVER!