Which epic poem was "Ave Maria" loosely based on, which is used by Wilfred Jackson in Walt Disney's "Fantasia"?
Wilfred Jackson: Wilfred Jackson (Chicago, Illinois, January 24, 1906 – Newport Beach, California, August 7, 1988) was an American animator, arranger, composer and director best known for his work on the "Mickey Mouse" and "Silly Symphonies" series of cartoons and the two segments "Night on Bald Mountain" and "Ave Maria" of "Fantasia" from Walt Disney Productions. Ave Maria (Schubert):  52, No. 6, 1825), in English: "Ellen's Third Song", was composed by Franz Schubert in 1825 as part of his Opus 52, a setting of seven songs from Walter Scott's popular epic poem "The Lady of the Lake", loosely translated into German.
The Lady of the Lake