This CD contains the legendary Black Sabbath performance from December 1970. The concert featured the original line-up of Ozzy Osbourne, Tony Iommi, Geezer Butler, and Bill Ward. The show is known for it's powerful and heavy sound, capturing the essence of Black Sabbath's early style that helped define heavy metal. The band's dark, demonic subject matter and riff-based songs were key elements of their signature sound.