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This is the device used to create the voices of the Daleks on Doctor Who, and it's something Toni Iommi has used - you can hear it on his guitar solo in "Paranoid." Despite the title, the song has no connection to the Marvel Comics character of the same name. It was also an era when the whole issue of pollution was starting to get attention, and this affected my thinking quite a bit.” It has been rumored that Osbourne sang through an oscillating metal fan to get the sound, but it's more likely that his voice was run through a processor called a ring modulator, which creates a wobbly electronic effect by mixing the input signal with an oscillator. Geezer also stated “What I always attempted to do with my science-fiction plots was to make these relevant to the modern world at the time, so I brought war and politics in. Geezer stated: "I liked the Hammer horror films in the 1960s and magazines such as Man, Myth and Magic, but I had a few supernatural experiences as a child and dreams that came true and that, more than anything, shaped my interest in the occult". How the distorted vocals at the beginning that say "I am Iron Man" were created has been a topic of debate. The title became "Iron Man", with Geezer Butler writing the lyrics around the title. Upon hearing the main guitar riff for the first time, vocalist Ozzy Osbourne remarked that it sounded "like a big iron bloke walking about".