Thought to have been written in response to George Harrison's alleged challenge to John Bonham that Led Zeppelin didn't do any slow songs, this mellow change of pace from Houses of the Holy is a prime example of "the ethereal Page and Plant," as the singer put it to Rolling Stone. "Sometimes we have backing tapes of tracks worked out and somebody goes, 'Well, we got no bloody lyrics,'" Plant explained. "'The Rain Song' was just sort of a little infatuation I had. The next morning I'd scribble it out. If I had done it the day after, it would have been no good."