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A blend of hardcore and metal music that evolved in the mid-to-late 90's with bands like Unbroken, Earth Crisis, Harvest, Endeavor, Poison The Well and Unearth. There is a liberal use of breakdowns in the music and the lyrical themes range from the political to the personal.

Often associated with the nu hardcore and fashioncore scenes.
"Bleeding Through is a present-day metalcore act."
by Straight Up June 18, 2004
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Metalcore is a genre that has been around since the eighties but not totally popularized until the mid 90's with bands such as Unearth, the modern forerunners in the genre. It includes a mixture of hardcore punk and heavy metal and uses generally two guitarists, a bassist and double kick drums for the instrumentals. Many bands use more than one singer, one generally for more melodic lines and the other, lead singer, who carries many of the vocal burden and usually "screams".
Metalcore bands include: 36 Crazyfists, As I Lay Dying, Bleeding Through, Bloodsimple, Diecast, God Forbid, Haste The Day, Hatebreed, Lamb of God, Norma Jean, Still Remains, Unearth, Walls of Jericho.
by The One You Seek December 20, 2006
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A genre of music that had began in the late 80s/early 90s. Originally combining elements of metal and hardcore, it has now evolved into a dime-a-dozen plethora of bands that sound exactly the same. New school metalcore bands borrow heavily from melodic European death metal combined with stolen Slayer riffs and vocals ranging from annoying screams to cupped-mike growls. Band names are usually longer than the songtitles (i.e. Between The Buried And Me, Every Time I Die, etc). Mostly caters to mallrat teens who are glued to Facebook, shop at Hot Topic, wear skinny jeans, skateboard, and play Call Of Duty all day long.
Old school metalcore: Insult II Injury, Merauder, Into Another

New school metalcore: Bullet For My Valentine, As I Lay Dying, All That Remains
by EmanNeercs August 17, 2012
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Shitty genre of music. It is said to be derived from hardcore punk and heavy metal, but really sounds like Panic! at the Disco with heavier guitar riffs. The vocalists are usually washed up emos.
Metalcore.
by Juicalicious January 21, 2011
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The latest trend in metal music... if you want to call it that. Metalcore is a genre crossbreed of heavy metal and hardcore that claims to be better than its nu-metal predecessors, which in some ways is true. However, metalcore is bad in it's own right. For example, every metalcore band sounds exactly the same, and god forbid the lead singers actually try to "sing" for once instead of the usual incoherent bad screaming. Metalcore is also unappealing and unlistenable to all but a small audience of devoted fans, as the songs lack any real hooks which keeps it from getting too mainstream, a double-edged sword. Metalcore has its ups, however; most metalcore bands are at least twice as talented as their nu-metal counterparts (instrumentally) and lacks the annoying rap aspect of said music. Heavy Metal fans should own at least one decent metalcore CD from bands like "Down the Sun" or "Sinai Beach", if only for the sake of being obnoxious and blasting it in your car with the windows down.
by Chernorizets Hrabr June 01, 2005
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Metalcore is a mix of heavy metal and hardcore music. It originated in the 1980's with bands like Integrity. Metalcore used to be refered to as Cross-Over Thrash, as stated by bands such as Dirty Rotten Imbecilesand Nuclear Assault.

Today, Metalcore and Cross-Over Thrash are considered two completely different genres of music. Nuclear Assault was among the first bands to call themselves Heavy Metal/Hardcore Punk band. Breakdown was arguably one of the earliest to fuse heavy metal-influenced riffing with a more traditional hardcore sound without being a thrash metal band.

Breakdowns are essential part of metalcore. Typically, the guitars play a set of rhythmically oriented riffs, usually on open strings so as to achieve the lowest sound the guitars are tuned for. These riffs are often accented by the drummer with double kick bass drums.
Examples of metalcore are: theBLED, Haste The Day, Bleeding Through, Underoath (Act Of Depression & Cries Of The Past), Killswitch Engage, As I Lay Dying, The Black Dahlia Murder, Bury Your Dead, Norma Jean, The Chariot, Darkest Hour, The Dillinger Escape Plan, Between The Buried And Me, Escape The Fate, Every Time I Die, Evergreen Terrace, Hatebreed, The Haunted, Misery Signals, The Number Twelve Looks Like You, Parkway Drive, Unearth, Vanna, and Walls Of Jericho.
by STEVECORE September 21, 2006
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