“Paranoid” ranks among Black Sabbath’s most famous songs, but Geezer Butler says he had to explain the word’s meaning to Ozzy Osbourne during recording. During an appearance on the Bob Lefsetz podcast, Butler recalled the session that birthed “Paranoid.” “We went in to record the second album and the producer said, ‘You’ve got to come up with another three minutes,’” the bassist explained. “Because in those days, an album wasn’t classed as an album unless it was over forty minutes or something. You had to have forty minutes worth of material for it to be classed as an LP. And this is just shor…