Aleister Crowley (1875–1947) was a British occultist, writer, and mountaineer, renowned for his influential works on mysticism and the esoteric. While not a musician himself, Crowley's philosophies and writings have profoundly impacted the music world. His image appears on the Beatles' "Sgt. Pepper's Lonely Hearts Club Band" album cover, and artists like Ozzy Osbourne and David Bowie have referenced him in their songs. Crowley's legacy continues to inspire musicians across genres, reflecting his enduring influence on popular culture. ([britannica.com](https://www.britannica.com/biography/Aleister-Crowley?utm_source=openai))