Phil, I'll admit that singin' those words to the melody helps, but even knowing the answer, I don't get it <g>. Well, perhaps that's an overstatement--if it needs so much help with an explanation, it doesn't belong in the punsters' Hall of Shame.
Oh, I get it now. We turn up the music real loud, act like we're hard of hearing, fill in the gaps, and bingo, it all makes sense! <vbg>
(BoP, hope you don't read the Old Timers thread...)