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At the beginning, you can take bands like Bolt thrower, Carcass, Napalm death (needless to say, he he ), Doom, Godflesh, Terrorizer, Disrupt, Intense Degree, Electro Hippies. All these bands that hit the punk world with brutal sounds, and a touch of metal in it... Then with years came other influencial listening sessions, other people, and bands like Dropdead, Sleep, Converge, High on Fire, Skitsystem, Disfear, Riistetyt etc. came to our hears, came with the background of new members etc. Outside music, you can handle with the idea that just taking a look outside is a sufficient influence to play grindcore.