IIRC it was called something like the Evolution of Metal or Evolution Metal. Like the title suggests they were going through all the influences of metal - classical (Paganini, dissonance), blues (Howlin` Wolf, guitar riffs), jazz (Buddy Rich), swing, opera (80's), rock'n'roll (The Kinks, Elvis, The Who, The Beatles etc). I've seen a few metal documentaries but never this one but it was narrated by the same guy in the other ones I have seen. I didn't know The Kinks got their distorted guitar sound on You Really Got Me by taking a razor blade to the woofer on the amplifier.
