When asked about the reference in a new interview with Total Guitar, Hammett admitted: “That’s really funny, because we called that riff ‘The Batman Riff’, and I know exactly what you are talking ...

In 1972, Deep Purple released a hard rock track with a spacey, sci-fi theme. The song, "Space Truckin'," featured distorted guitar and organ riffs and high-pitched screams from lead singer Ian Gillan ...