Ellen DeGeneres hit the right notes with "American Idol" viewers. Fans took to the Internet to express their pleasant surprise over the 52-year-old funnylady's debut as the singing competition's fourth judge. DeGeneres assumed her judging panel post for Tuesday's episode chronicling the first round of "Hollywood Week," the cutthroat post-audition phase in which 181 contestants will be narrowed down to 24 semifinalists.