Ceremony, Man is the Bastard and Spazz. Grindcore Grindcore is an extreme genre of music that began the early to mid-1980s. Grindcore music relies on heavy metal instrumentation and eventually changed into a genre similar to death metal. Grindcore vocals, according to AllMusic, range "from high-pitched shrieks to low, throat-shredding growls and barks". Grindcore also features blast beats; according to Adam MacGregor of Dusted, "the blast-beat generally comprises a repeated, sixteenth-note figure played at a very fast tempo, and divided uniformly among the kick drum, snare and ride, crash, or hi-hat cymbal." The band Napalm Death invented the grindcore genre; their debut album Scum was described by AllMusic as "perhaps the most representative example of" grindcore. Beatdown hardcore Beatdown hardcore (also known as heavy hardcore, brutal hardcore, toughguy, and moshcore) is a style of hardcore punk and heavy metal which has deep, hoarse vocals, down-tuned guitars, blast beats, and slow breakdowns. More heavy metal-influenced than traditional hardcore punk, Rotting Out, Strife, Shai Hulud, Madball and Hatebreed all are beatdown hardcore bands. Metalcore Metalcore is a fusion genre that merges hardcore punk with extreme metal. Metalcore has screaming, growling, heavy guitar riffs, breakdowns, and double bass drumming. Heavy metal-hardcore punk hybrids arose in the mid-1980s and would also radicalize the innovations of hardcore as the two genres and their ideologies intertwined noticeably. The term has been used to refer to bands that were not purely hardcore nor purely metal such as Earth Crisis, Integrity and Hogan's Heroes. During the 2000s there was a metalcore explosion and bands like Bullet for My Valentine, Killswitch Engage, Atreyu, Shadows Fall, and As I Lay Dying all had some popularity. Grunge In the mid-1980s, bands such as Melvins, Flipper and Green River developed a sludgy, "aggressive sound that melded the slower tempos of heavy metal with the intensity of hardcore," creating an alternative rock subgenre known as grunge. Grunge evolved from the local Seattle punk rock scene, and it was inspired by bands such as the Fartz, 10 Minute Warning and the Accüsed. Grunge fuses elements of hardcore and heavy metal, although some bands performed with more emphasis on one or the other. Grunge's key guitar influences included Black Flag and the Melvins. Black Flag's 1984 record My War, on which the band combined heavy metal with their traditional sound, made a strong impact in Seattle. Digital hardcore Nintendocore, another musical style, fuses hardcore with