Fantasia, the Walt Disney classic released in 1940, consists of eight segments of animated imagery set to eight separate pieces of classical music. When Disney created a multi-channel recording process for the soundtrack, Fantasia became the first film in history to be released in stereo sound. The eight classical pieces are Toccata and Fugue in D Minor, Nutcracker Suite, The Sorcerer's Apprentice, The Rite of Spring, The Pastoral Symphony, Dance of the Hours, Night on Bald Mountain, and Ave Maria. Originally created to boost the popularity of the Mickey Mouse character, Fantasia developed into a feature length project when the full cost of each of the segments was realized. Fantasia was originally a box office and critical failure, with Walt Disney himself claiming that it was a "mistake." It has since become an American classic and has earned a place as a hallmark of American cinema. A sequel was released in 1999 entitled Fantasia 2000.