John Travolta hosts the American Film Institute's countdown of the 100 greatest movie songs as determined by 1500 experts in the film industry. Likely top contenders include "Over the Rainbow," "As Time Goes By" and "The Way We Were." Among those commenting are Clay Aiken, Debbie Allen, Carole Bayer Sager, Burt Bacharach, Keith Carradine, Celine Dion, Art Garfunkel, Barry Gibb, Marvin Hamlisch, Isaac Hayes, Angela Lansbury, Debbie Reynolds, Paul Simon and Barbra Streisand.