The guitar riff was inspired by Eddie Cochran's "Nervous Breakdown." Jimmy Page used a small, miked amplifier to create the "guitar in a shoebox" sound. Explaining his technique to Guitar Player magazine in 1977, Page said: "I put it in a small room, a tiny vocal booth-type thing and miked it from a distance. You see, there's a very old recording maxim which goes, 'Distance makes depth.' I've used that a hell of a lot on recording techniques with the band generally, not just me. You're always used to them close-miking amps, just putting the microphone in front, but I'd...