@RelentlessOblivion @FatherAlabaster
Well actually rock wouldn't exist without Blues music - which isn't Jazz. Look at black musicians like Howlin' Wolf and you will see the influence it has on both Rock and Metal - particularly early metal artists like Black Sabbath. Rock'n'Roll of the 50's, which without, music as we know it wouldn't exist, was a combination of country and blues. So, even if you don't classify metal as apart of rock - because metal also draws from classical and heavy music - You must acknowledge that the genres are interlinked. (Not to even mention the influences that the other Rock off shoot, Punk, would have on later metal genres.)
(This is actually an interesting topic, is there a thread discussing the influences and evolution of Metal?)