Pink Floyd’s original frontman, Syd Barrett, did so much LSD that he experienced a mental breakdown just as the band began to achieve mainstream success. His drug use began as mind-altering inspiration for his art, but quickly became a coping mechanism for the demands of commercial success. He became paralyzed in front of television cameras. He detuned his guitar until it was literally unplayable and refused to perform alongside his band. Then he stopped showing up at all.