premise: Part of the AFI 100 Years… series, AFI's 100 Years…100 Songs is a list of the top 100 songs in American cinema of the 20th century. The list was unveiled by the American Film Institute on June 22, 2004, in a CBS television special hosted by John Travolta, who appeared in two films honored by the list, "Saturday Night Fever" and "Grease".
hypothesis: The AFI 100 years has been on for 15 years.
reason: The AFI 100 years was unveiled 15 years ago in 2004.