via youtube.com
Fascinating. Via wikipedia:
The band itself has for the most part ignored such claims; in response to the allegations, Swan Song Records issued the statement: "Our turntables only play in one direction—forwards". Led Zeppelin audio engineer Eddie Kramer called the allegations "totally and utterly ridiculous. Why would they want to spend so much studio time doing something so dumb?"[45] Robert Plant expressed frustration with the accusations in a 1983 interview in Musician magazine: "To me it's very sad, because 'Stairway to Heaven' was written with every best intention, and as far as reversing tapes and putting messages on the end, that's not my idea of making music."[46]