History in Five Songs 266: Is Black Sabbath progressive metal?

In Episode 266, Martin wonders aloud if any of Black Sabbath's catalog constitutes progressive metal. Black Sabbath – “Under the Sun” Black Sabbath – “Spiral Architect” Black Sabbath – “Megalomania” Black Sabbath – “Into the Void” Black Sabbath – “Supertzar” Learn more about your ad choices. Visit megaphone.fm/adchoices