I believe that THE 12 DAYS  CHRISTMAS is the most satirized song of all time.
I can't PROVE this, but , I have collected, MANY satires of it.

The list below has 143 songs listed.

If you have any of the following then please email gasarch@cs.umd.edu

a) a CORRECTION to one of the following entries, or
b) more info on one of the following entries, or
c) a NEW entry

NOTE: Songs that have no interest beyond a very few people do not count.
THANKS: Evan Golub helped me find some songs on the web.
FUTURE THANKS: If you deserve thanks on a song and are not listed, let me know.

The list is in alphabetial order by topic,
except one which I got recently which DEFIES being
characterized but is GREAT so I put it FIRST.

THE 55 DAYS BEFORE Kri$ma$ INFO 

A B C DEF G H IJKLM NOPQ R S T UVWXYZ NEED_MORE_INFO

I name the song by TOPIC so

12 D's AIRFORCE means a 12 days song having to do
with the airforce.

AAA
12 D's DOUG ADAMS INFO
12 D'S AFTER  INFO
12 D'S  AIRFORCE INFO 
12 D'S  ALPHAN   INFO
12 D'S  ANALYSIS INFO
12 D'S  ANATOMY INFO
12 D'S  ANT FAN STYLE   INFO
12 D'S  AOL  INFO
12 D'S  ASCII INFO
12 D'S  AUSTRALIAN  INFO
12 D's  AUSTRALIAN(2)  INFO

BBB
12 D'S  BAYOU   INFO
12 D'S  BETA TESTING INFO
12 D's of BLOGGING INFO
12 D's of BUFFY INFO
12 D'S  BUSINESS INFO
12 BUGS   INFO

CCC
12 D's  CAMPING INFO
12 D'S  CATS  INFO
12 D'S  CATS (2) INFO
12 D'S  CHANUKAH INFO 
12 D'S  CHICAGO  (Gangster stuff)  INFO
12 D'S  CHIPMUNKS INFO
12 D'S  by CHAD MITCHELL TRIO INFO
12 D'S  COMMON HERITAGE  INFO
12 D'S  COWS  by Spinnaker Enterprises INFO
12 D'S  CRYPTMAS by The Right Stuff INFO
12 D'S  CLINTON by Capital Steps INFO
12 D'S  CLINTON INFO
12 D's of  CLINTON by Paul Shanklin INFO
12 D'S  COLLECTING  INFO
12 D'S  COMPUTERS by BYTE1981? INFO
12 D'S  COMPUTERS by BYTE1981? (2) INFO 
12 D'S  COMPUTERS (3) INFO
12 D'S  COMPUTERS (4) INFO 
12 D'S  COMPUTERS (5) INFO 
12 D'S  CUB SCOUTS  INFO

DDD,EEE,FFF
12 D'S  DENTISTISTRY by Keith and Margulis INFO
12 D'S   by John Denver and Muppets INFO
12 D'S  DOWNSIZING  INFO
12 DRINKS   by Lord Bob and the Amazing Bobettes INFO
12 DRUGS   by the Mushroom Tabernacle Choir INFO
12 DRUM CORPS DAY   INFO
12 D'S  ELVIS INFO
12 D'S  FAST FOOD INFO
12 D'S  FINALS INFO
12 D'S  FIRST GRADERS by FIRST GRADERS
12 D'S  FITNESS INFO
12 MONTHS  FLORIO by Ron Capik INFO
12 D'S  [FILL IN FOOTBALL TEAM] by Elliot, Walter, and Bennet INFO
12 D'S   (The Game Plan to Beat Miami) by Ron Jacobs INFO
12 D's  FRASIER INFO
Its a Fan Boy Christmas by Lukeski INFO


GGG
12 Days of Christmas (Gospel Version) lyrics
12 GAY D'S   by the Go Go Boys INFO
12 GAYS   by Venus Envy INFO
12 GIFTS  CHRISMAS by Alan Sherman INFO
12 D'S  GREAT WHITE NORTH  by McKenzie Bros INFO
12 D'S  GENEALOGY  INFO
12 D'S  GETO GANG   INFO
GREEN  by Stan Freberg INFO
12 D'S  GOVERNMENT 
INFO

HHH
12 D'S  HALLOWEEN1 INFO
12 D'S  HALLOWEEN2 INFO
12 D'S  HANNAKAH  INFO
12 D'S  HANNAKAH (2) INFO
12 D'S  HANNAKAH (3) INFO
12 D'S  (LA KINGS) HOCKEY by STRUTHERS INFO
12 D'S   (HAWAII VERSION) INFO
12 D'S  HEADACHE INFO
12 D'S  HEARINGS by The Impartial Jury INFO
14 D'S  HOMESCHOOLING INFO
12 D's of HOSER INFO

III,JJJ,KKK,LLL,MMM
12 D's of INTERACTIVE FICTION INFO
12 D'S  IMPEACHMENT by Robert Lund and the Interns INFO
12 D'S  JAVA  INFO
12 D'S  JOURNALISM INFO
12 D's of LOIS AND CLARK INFO 
12 D'S   (KIDS) by Lauren Hoffman INFO 
12 D'S   (KIDS2)  INFO 
12 D'S  KINDNESS INFO
12 D'S  KITTEN  INFO
THE LITERAL 12 D'S    INFO
THE LITERAL 12 D'S   (LETTERS) INFO
12 D's LOGO INFO
12 D'S   by Mammoth Yuletide Singers INFO
12 D'S  MATH INFO
12 D'S   (MODERN WORLD) by Sarah Murray INFO
12 D'S  MICROSOFT INFO
12 D's  METAPHYSICAL MP3
12 D'S  MUDDER INFO
12 D'S  MUDDER 2 INFO

NNN,OOO,PPP,QQQ
12 D'S  NEEDLEPOINT INFO
12 D'S  NORTHWEST by Kevi Sutter INFO
12 D'S  ORTHODONTURE INFO
12 D'S  PATTERNS INFO
12 PAINS   INFO
12 D's POL CORRECTNESS INFO
12 D'S  : PRICE INDEX INFO
12 D'S  PARENTS INFO
12 D'S  PASCAL'S TRIANGLE INFO
12 D'S  PHYSICS  INFO
12 D'S  PRICES INFO
12 D's of PROGRAMMER SHELL SCRIPTS INFO
12 D'S  PUPPY INFO


RRR
12 D's RABBITS INFO
12 D's REDNECK INFO
12 D'S  REHAB by Pat Godwin INFO
12 D'S  : RELIGOUS MEANING INFO
12 D's OR RESEARCH INFO
12 D'S  : REVERSE ENGINEERED by Thomas Ball INFO
A TOTALLY RIDICULOUS 12 D'S   by Frank Welker INFO

SSS
12 D'S  SCOUTS by PACK 114 INFO
12 D'S  SCRAPBOOKS INFO
12 D'S  SEX  INFO
12 D'S  SPACEGHOST  INFO
12 D's  SPORTSMAN INFO 
12 D'S  SOJIRO  INFO
12 D'S  SOUTHPARK  by Arthur Levesque INFO
12 D'S  STAR TREK INFO
12 D'S  SUMMER CAMPS INFO
19 D'S  SUMMER CAMPS INFO
12 D'S  SWAMPTHING  INFO
12 D'S  SWEATSHOP INFO

TOP


TTT
12 D'S  TECHNOLOGY INFO
12 D'S  (OLD) TECHNOLOGY INFO
12 D'S  TENURE by William Gasarch INFO
A TERRORISTS  by James and Kling INFO
12 D'S  TEXAS by Deborah Jeter INFO
12 D's of TOUNGUE TWISTERS INFO
12 D'S   (Toolbox) by Woody Phillips INFO
12 TIPS   by Reduced Shakespear Company INFO
12 D'S  TURKEY  INFO
12 D'S  TWIN PEAKS  INFO

UUU,VVV,WWW,XXX,YYY,ZZZ
12 D's UNABOMBER INFO
12 D's FOR UNITARIAN"S INFO
12 D'S  UNIX INFO
12 D'S  VET SCHOOL INFO
12 D'S  VIETNAM  INFO
12 D'S  VIOLENCE INFO
12 D'S  WASHINGTON by Kathy Engel INFO
12 D'S  WEBSITES  INFO 
12 D'S  WEBSITES by NETSURFER DIGEST INFO 
12 D'S  WEIRD AL INFO
12 D'S   WINDOWS INFO
12 D'S  X-FILES INFO
12 D'S  X-FILES2  INFO
12 D'S  YAKSMAS by Ren & Stimpy INFO

NEED_MORE_INFO
12 D'S   3 Blond Mice INFO
12 D'S   by John Valby aka Dr. Dirty INFO
12 D'S   by Yin and Yan INFO