Black Sabbath were almost done with their second album when producer Rodger Bain told them it was a little short. He asked for one more quick song, and when the rest of the group stepped out for lunch, Tony Iommi began composing a new riff. The group loved what they heard, and Geezer Butler started writing lyrics. "I don't think we even know what the word 'Paranoid' meant at the time," Iommi wrote in his book. "That's why we left it to Geezer, because we considered him to be the intelligent one." They never thought the song would become a huge hit. "It probably took four minutes to write," said Iommi. "It's that basic, simple thing, that catchy theme, that seems to appeal to people." The label loved the song and insisted it be the first single, even changing the name of the album from War Pigs to Paranoid. It was their first hit in America and changed their lives forever.