William Hung gained fame due to his off-key audition performance of "She Bangs" by a singer that belonged to what boy pop group at the age of 12? 
William Hung: William James Hung, also known as Hung Hing Cheong, is a Hong Kong-born American former singer who gained fame in early 2004 as a result of his off-key audition performance of Ricky Martin's hit song "She Bangs" on the third season of the television series "American Idol". Ricky Martin:  Martin began his career at age 12 with the all-boy pop group Menudo.
Menudo