Hardcore was pretty short lived, I think it was the 80 - 86 era of bands and it really only stood to show a difference between earlier Punk bands and the new more aggressive music. Like I said it was more of a difference in attitude than anything else but a couple of quick examples would be Agnostic Front, Bad Brains, Cro-Mags, Warzone, SS Decontrol were all Hardcore bands. Crass, X, The Germs, Iggy Pop and DK would all be considered Punk.
Triphamr
80gb, black and full