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Grindcore: Napalm Death, Mertzbow, and Terrorizer.

Powerviolence: Man Is The Bastard, Spazz, and Charles Bronson.

Metalcore: Converge, Dillinger Escape Plan, As I Lay Dying, Trivium, and Pantera.

Screamo: Orchid, Pg. 99, Neil Perry, Portraits of Past, City of Caterpillar, In/Humanity, and Joshua Fit For Battle.

Post-Hardcore: Fugazi, Thursday, Silverstein, La Dispute and Laughing Hyenas (Come Down to the Merry Go Round, Life of Crime and Hard Times)

Melodic Hardcore: Rise Against and Title Fight.

Once you've listened to the classics, it's good to check out more contemporary iterations of hardcore music. There are bands staying true to the vibe of the original hardcore masters, bands like OFF!, which is fronted by the former Black Flag and Circle Jerks frontman Keith Morris, while younger bands like Converge and Nails have taken hardcore to brutal new heights. Increasingly, hardcore sounds have mixed with metal and other forms of extreme music to fuel all sorts of other hybrid genres. While the categories aren't by any means rigid, and many of the bands might disagree with the following categories, here's a brief breakdown of some distinct and popular genres and some bands that are sometimes associated with them: