The Clash, by The Clash - and to be honest most of the early punk albums. In comparison to Never Mind The Bollocks by The Sex Pistols, The Clash sounds really dated/of its time, whereas NMTB could have been produced anytime onwards of 77. Not that I dislike said Clash album, far from it, and in some ways I think the rough production shows where punk really came from, but listening to the production now it sounds like a demo imo. But a bl88dy great demo.