An interesting note about the intro, the acoustic part - it was stolen material, note for note, from a song called Taurus by Spirit, released a couple of years earlier. They were pretty open about it - the lead singer of Spirit, Randy California, recalls: "When we did our first tour of Europe, in late '68 or maybe '69, all those guys used to come up and sit in the front row of all our shows, and we became friends. If they wanted to use that, that's fine. I'll let them have the beginning of 'Taurus' for their song." And such is rock and roll history made.