Foxnews.com has put up a list of 10 songs that are torture on the ears:
"Cherry Pie" by Warrant
"Tubthumping" by Chumbawumba
"I'm Too Sexy" by Right Said Fred
"Macarena" by Los Del Rio
"Never Gonna Give You Up" by Rick Astley
"Pieces of Me" by Ashlee Simpson
"Rico Suave" by Gerardo
"We Built This City (on Rock and Roll)" by Starship
"Who Let the Dogs Out?" by Baha Men
"Simply Having a Wonderful Christmas Time" by Paul McCartney
I think it's hard to include McCartney in that list, simply because of all the other good songs he has released, where the other bands haven't done much of anything. Sure, Starship was great as Jefferson Airplane, but they didn't do jack as Starship. McCartney released good stuff in all forms.
I also think we'd need to add in something by Miley Cyrus, Britney Spears and a whole bunch of other "singers."