If you mean Metalcore in the original context as it was used originally in the 80s, "Technophobia", "God Is Dead", "Male Supremacy", and "World Wars III and IV" by Carnivore would be among my top picks. For the stuff currently branded as Metalcore.... well, you're asking for an opinion, and mine is that it's all garbage, and is just yet one more wave of false Metal.
With eyes wide shut - Blessthefall
The key elements of a metalcore song structure typically include a combination of aggressive guitar riffs, breakdowns, screamed vocals, clean choruses, and dynamic shifts in tempo and intensity.
The best type of music is most definatly hardcore/death metal/post hardcore/emo/screamo/metal/metalcore/alternative/rock or any combination of those.
Metalcore, and not anymore, after Waking The Fallen, they stopped screaming, and the first Metalcore song they've written since then is God Hates Us.
Trivium - Definately asking alexandria abandon all ships
Neither, its Metalcore, not just plain-old metal
Catherine - metalcore band - was created in 2003.
Catherine - metalcore band - ended in 2009.
Parkway Drive, a metalcore band from New South Wales, Australia performs the song Boneyards. The band got its name from the street the band members practiced on.
metal? emo? 'emo' and 'metalcore' are different genres 'emo' being 'emotional rock'
Bullet for My Valentine is a metalcore band. The band is from Wales, United Kingdom.
Mike D'Antonio is the bass player for Killswitch Engage, a Metalcore band. The best band in the world