"Paris Makes Me Horny" from VICTOR/VICTORIA
"I Can't keep it down" from FAME (If this had been in a revue like NAKED BOYS SINGING or WHEN PIGS FLY, I might have thought it funny...)
Someone mentioned "Wedding of the Year" in HAPPY HUNTING - there are two even worse in that score: "Everyone who's Who's who" and the un-recorded "For Love or Money." (THe script BTW is awful! It shows how dynamic Ethel Merman was to have made the show run a year and almost make money. It was her only commercial flop, though it recovered about 80% of its costs by the closing.)
The worst score I have ever heard on Broadway was for SUNSET BLVD. I know a lot of people love this show but I suspect it is not because of the score but rather due to the story (from the excellent screenplay) and the set (which was awesome.)
Cast albums are NOT "soundtracks."
Live theatre does not use a "soundtrack." If it did, it wouldn't be live theatre!
I host a weekly one-hour radio program featuring cast album selections as well as songs by cabaret, jazz and theatre artists. The program, FRONT ROW CENTRE is heard Sundays 9 to 10 am and also Saturdays from 8 to 9 am (eastern times) on www.proudfm.com