#234 Black Sabbath, 'Master of Reality' (1971)

The third record by Metal’s founding fathers starts off with a tape loop of Tony Iommi coughing from a joint he had been smoking with Ozzy. The song that immediately follows is ‘Sweet Leaf,’ the band’s love letter to marijuana. This album is sludgy and heavy. Considered as one of the first Stoner Rock albums, the album was poorly received at the time but has come to be considered one of the greatest Metal albums of all time.