(Leonard Maltin reads the clue.)  A chance meeting with Leopold Stokowski led Walt to hire him for a "Sorcerer's Apprentice" short; Stokowski prodded him into making a longer film, this 1940 epic
The working title of this film, which was Walt Disney's third feature-length 
picture, was ... make a Silly Symphony cartoon short of Paul Dukas' "The 
Sorcerer's Apprentice.