I'm mostly into Tradtional Heavy Metal (Black Sabbath, Judas Priest, Iron Maiden...) and Thrash Metal (Anthrax, Metallica, Megadeth, Slayer..) I don't consider Zeppelin to be metal, just hard rock. Is there any difference between hard rock and metal?
Speaking of Led Zeppelin, I'll nominate Led Zeppelin IV
Also, will there be an end to this list or will it go on...