Led Zeppelin
Heavy metal

Exposing the works of Satan: Popular Music      Jimmy Page , who was a devout follower of Satanist Aliester Crowley, was believed to be used as a vehicle for demonic spirits in his music. Other members of Led Zeppelin were said to experience 'automatic writing': "He [Robert Plant ] often remarked that he could feel his pen being pushed by some higher authority." (Stephen Davis, Hammer of the Gods, p. 262). In one of their songs when played backwards you can actually hear demonic messages