Black Sabbath, The Ozzy Years 

Black Sabbath’s era with Ozzy Osbourne fundamentally birthed heavy metal, transforming blues into something dark, heavy, and menacing. Driven by Tony Iommi’s iconic, down-tuned riffs, songs like "Black Sabbath" introduced a sense of dread previously unheard in popular music. Anthems like "Paranoid" and "Iron Man" defined the genre's sonic blueprint with their crushing power and simplicity. Geezer Butler’s lyrics, exploring occult themes, mental isolation, and social rebellion—most notably in the anti-war epic "War Pigs"—found their perfect vessel in Ozzy’s haunting, wailing vocals. Together, they created a raw, occult-drenched atmosphere that remains the ultimate foundation for all heavy music.