Grindcore: I'm sure all the readers of this blog should at the very least have a minor understanding of the origins of grindcore. I shouldn't have to do the whole history/Napalm Death vs. Repulsion thing here, y'all are pretty smart. In a nutshell, grindcore has always been a blend of metal, and hardcore. Back in the day, bands like Napalm Death were equally inspired by bands like Celtic Frost, Discharge, Crass, and what little death metal there was. Nowadays, a lot of the hardcore punk influence has been put to the side, and the modern grindcore sound is significantly more metallic. There are three characteristics, that to me, define grindcore. Speed, the blast beat, and short songs. Duh, right? But there's this special marriage between all of them which sets it apart from other music with these traits, like death metal. There's this urgency with grindcore, the need to dismiss all the bullshit and get all the aggression and intensity out as quickly as possible. Grindcore songs are supposed to kick you in the head, and then end before you know what happened. Not to say that there's no room for actual riffs, or memorable hooks. Bands like Nasum could bring the intensity, but still write a heck of a song. What more people need to understand that not every band with a blast beat is a grindcore band. I'm really curious where this thought process came from. Maybe it started with that "Grindcore Sucks" video that popped up on Youtube a few years ago, mocking Waking The Cadaver while one of their songs played. We all know WTC isn't grindcore, but a popular video like that is bound to influence people who don't really get it yet, and make them think bands like that are grindcore. Hence, you get bands making merch to sell to kids like the one in the picture above. To wrap it all up, grindcore is characterized by metallic riffs, played at incredibly fast tempos, with a little to a lot of hardcore punk influence, and short songs. Good? Good.
Hope all this helped a bit!