In 1965, a factory machine crushed Tony Iommi’s fingertips on his last day of work. Doctors said his guitar career was over. At 17, his dream should have ended. Instead, he melted plastic bottles, made prosthetic fingertips, and detuned his guitar to reduce pain. That limitation created a darker, heavier sound the world had never heard. With Black Sabbath, Iommi turned injury into innovation and accidentally invented heavy metal. What broke him became his signature. Every crushing riff today tra