'Master Of Reality' was the third studio album by Black Sabbath. Originally released in July 1971, it is widely regarded as their most sonically influential work - the foundation of doom, stoner and sludge metal.

The album was the last Black Sabbath album to be produced by Rodger Bain, and was certified double platinum after having sold over 2 million copies. 'Master Of Reality' was Black Sabbath's first and only top 10 album in the US, peaked at number five on the UK Albums Chart, and at number eight in the United States, where it achieved Gold status on advance orders alone.