When I was a teenager, working towards dropping out of high school to starting to tour with bands, I'd drive around in my VW Bug every morning before school, very stoned listening over and over to Zeppelin. This song got to me because it just seemed mystical. There is something about those Celtic tunings that almost sounds Eastern. Somehow it would sweep me up into my own little trance-like state, like Sting with those shamans in the Amazon. But all I had was a bong and a Led Zeppelin cassette.