According to the site below, May's edition of the north-american magazine Blend will feature a list of the worst 50 songs ever.

Below is the list of the "top" 10.

"We Built This City" - Starship (1985)
"Achy Breaky Heart" - Billy Ray Cyrus (1992)
"Everybody Have Fun Tonight" - Wang Chung (1986)
"Rollin'" - Limp Bizkit (2000)
"ICE ICE BABY - VANILA ICE(1990)
"The Heart of Rock & Roll" - Huey Lewis & The News (1984)
"Don't Worry, Be Happy" - Bobby McFerrin (1988)
"Party All the Time" - Eddie Murphy (1985)
"American Life" - Madonna (2003)
"Ebony and Ivory" - Paul McCartney e Stevie Wonder (1982)

Source (in Portuguese):
http://musica.uol.com.br/ultnot/2004/04/20/ult89u4831.jhtm

Source: Arnaldo Silveira (Notice Board)