Mathcore

Mathcore, also known as math metal, tech hardcore, or chaotic hardcore, is a hardcore punk subgenre recognized for a high level of technical musicianship. The genre has its roots in bands like Botch, Deadguy, Kiss it Goodbye, Knut and Rorschach and is currently being promoted by bands such as The Dillinger Escape Plan and Converge.

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The music is usually filled with discordant, somewhat grindcore-inspired riffing, complex time signatures and song structures, and usually indecipherable lyrics. Songs played by bands of this style tend to vary from mere seconds in length to over 15 minutes and rarely feature a conventional verse-chorus song structure. Other styles of music, such as blues-rock and free jazz have been known to inspire various mathcore bands. Coalesce have been influenced by the former, to the extent of releasing a Led Zeppelin cover EP named 'There is Nothing New Under the Sun', whereas The Dillinger Escape Plan are known to credit the latter.

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Other notable bands in this style: Psyopus, Ion Dissonance, Curl Up and Die, Daughters, The End, The Power and the Glory, Creation is Crucifixion, Misery Signals, Spiral Architect, Foreign Objects, Into The Moat, and Spastic Ink.

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Hardcore punk: Hardcore punk (or hardcore) is an intensified version of punk rock usually characterized by short, loud, and often angry songs with exceptionally fast tempos and chord changes....

Botch: Botch was a mathcore band from Tacoma, Washington, that formed in 1993 and disbanded in 2002. Its members went on to form Roy, Minus the Bear, and These Arms are Snakes among others....

Deadguy: Deadguy is a now defunct metal band from New Jersey....