Change just one letter in a popular song and give a rationale for it.
Example “You Light Up My Wife” - sung by Joan of Arc’s husband.
Take it, Satchmo …
“Born to be a wife!” by… I forget.
Errr… “Burn in the USA”? Lame.
This is harder than I thought. I think I’m off to the Babelfish Song Fun Thread again. 
perhaps a cattleman’s song:
*A Herd Day’s Night
There’s Michelangelo’s theme song:
Chip It! (Chip It Good)
From Sting’s latest CD Brand New Lay
A Thousand Gears
One surfer reassuring another?
“Hey Dude”
Who can forget Duran Duran’s homage to the Osmonds -
Mild Boys?
Jungle Booger by that guy with a cold in the Amazon. . . . no? How about Stray Rat Strut by Willard? I Believe I Can Fry By one of those Iron Chef guys. It’s Umpossible by Ralph Wiggum.
Please stop me before I pun again!
Of course there’s Freud’s rendition of Crazy Brain
Then there’s Lee Iacoca’s version of Highway to Sell
and that great grooming classic from Dex’s Midnight Gunners, “Comb on Irene”
‘El Condom Pasa’ by Semen and Garfunkel
From the rap world we have the Grandmaster Flash and the Furious Five’s erotic classic about a visit to a parlor: “The Massage”.
Well, there’s the classic 70’s song about hardware stores: “Socket Man”.
Don’t forget Roberta Flacks anti-drugs song Killing me softly with his bong.
Is this the same “Semen” who sang Loves Me Like a Cock? 
There’s also:
Don McLean’s farmyard anthem, American Pig;
Madonna’s take on classical literature, Like a Virgil;
Lionel Ritchie’s paean to wobbly dessert food, Jello;
Michael Jackson’s tribute to Whitney Houston, Shriller;
The Tokens songs about medication for mental patients, The Loon Sleeps Tonight…[sub]oog…must stop now…[/sub]
The paean to the Clinton Administration * American Lie *
Egad! I’ve wandered into a Frank & Ernest cartoon!
ObReply: It’s only fitting that the Trashmen paid homage to Shakespeare with Surfin’ Bard, what with their flowery writing style and everything.
From the spooky coincidence dept: early morning here, checking the various threads before work starts and I have the place to myself. While this very thread is opening, I dash to the bathroom for a quick…um, quality time. While there, I pick up as reading material “Uncle John’s Legendary Lost Bathroom Reader” (We are a high class biz here) and encounter on page 541 a whole page of these things from a magazine competition.
My favorite? Fifty Ways to Lease Your Lover billed as “a way to beat the recession.”
Song the Jackson Five wrote for their appearance on British TV: BBC.
CCR’s tribute to backyard barbecues: Cookin’ Out My Back Door.
Melanie’s ode to beer: Brand New Keg.
Jim Croce’s song for serious Irish dancing: You Don’t Mess Around with Jig.
Al Stewart’s song about a mean dog: Fear of the Cat.
The Monkees’ song for baseball pitchers: I’m a Reliever.
And as long as we have a thing for Paul Semen happening, what about the song he wrote about his favorite underwear: The Boxers?
There’s the tragic tale of Larry and Curly’s last day on Earth - Hey Moe
And the sad but true story of middle-age weight gain - The Noodle and the Damage Done