>>126865299Motorhead and venom are basically punk. Their sound directly derives from ramones, the cramps, the dictators, and garage rock in general. They were based on fast power chords and a danceable upbeat groove. Black sabbath were based on riffs, so not power chords but a catchy melodic idea based around a root note. The big evolution in metal came with early iron maiden, who took the riffs, solos, and long-winded strucure from sabbath and other proto-metal bands but removed the blues inspired aspect almost entirely.