Released on the 2002 compilation album Symptom Of The Universe: Black Sabbath 1970 - 1978, this track by Black Sabbath stands as a definitive example of the band's early heavy metal sound. The recording captures the raw, distorted energy characteristic of the late 1960s and early 1970s era, featuring Ozzy Osbourne's distinctive vocals and the group's signature blend of blues-based riffs and doom-laden rhythms. As a staple of their discography, the song exemplifies the band's transition from psychedelic rock to the heavier, more aggressive style that would define their legacy. It remains a crucial piece of their catalog, showcasing the foundational elements of hard rock that influenced countless subsequent artists.