"Hey hey what can I do I've gotta woman that won't be true"....sounds familiar, yes the song remains the same greatest movie that is in a concert/fantasy based setting. About Mr. Plant if you've ever heard the BBC sessions then you know he is pretty damn good at improv lyrics. His favorite lyric to add in during songs is a(n) line from the Lemon Song "squeeze my lemon till the juice runs down my leg, squeeze it so hard I fall right out of bed" only a great lyricsist could come up with that one, which is why Zep rules.