Master of Reality is the third studio album by British heavy metal pioneers Black Sabbath, released in 1971. This landmark release marked a pivotal moment in the evolution of heavy metal, featuring guitarist Tony Iommi's innovative detuning of his guitar down three semi-tones to C-sharp—a technique developed to accommodate finger injuries from a factory accident. This adjustment created a heavier, darker, and sludgier tone that profoundly influenced the development of doom metal and stoner rock. Bassist Geezer Butler matched Iommi's tuning, solidifying the band's signature crushing sound. Widely regarded as one of the most influential albums in metal history, Master of Reality delivers iconic tracks that defined a genre.

• Artist: Black Sabbath
• Format: Audio CD
• Genre: Heavy Metal, Hard Rock

• Release Type: Deluxe Edition
• Edition: Remastered
• Audio: Remastered Audio

• Media: 2 CDs
• Bonus: Bonus disc of unreleased material
• Extras: Booklet with rare photos and memorabilia, new liner notes by David Wells