The question always cums up but nobody can agree. Who would you vote for? BLUE CHEER (60's San Fran band often overlooked but put on there cover of "summer time blues" and it sounds very heavy for its time, if not the first they are a big influence) LED ZEPPELIN (I think most people will call this very hard rock but Robert Plants vocal style influenced literally thousands of rock vocalist after him. The exploitation of groupies, trashing hotels, the strong arm manager, the satanic overtones its all there you've seen repeated over and over) BLACK SABBATH (Original lead singer Ozzy is the most famous and an icon, The metal riff as we know evented by Lead Guitast Tommy Iommi adapting to a tuned down sound using prosthetic after chopping parts of his fingers by accident. They also incorporated the feel of horror movies into there music) DEEP PURPLE (Sounds more of a Blues band playing really really loud, but a major influence on everyone after thim) JUDAS PRIEST Rob Halford states Zeppelin and Deep Purple was his early influences. They may be the biggest influence on Metal in its look with the spikes and "Hell Bent For Leather" what do you think?