The success of "Silly Symphonies" would be tremendously boosted after "Three Little Pigs" was released in 1933 and became a box office sensation; the film was featured in movie theaters for several months and also featured the hit song that became the anthem of the Great Depression, "Who's Afraid of the Big Bad Wolf". Several "Silly Symphonies" entries, including "Three Little Pigs" (1933), "The Grasshopper and the Ants" (1934), "The Tortoise and the Hare" (1935), "The Country Cousin" (1936), "The Old Mill" (1937), "Wynken, Blynken, and Nod" (1938), and "The Ugly Duckling" (1939, with an earlier black-and-white version from 1931), are among the most notable films produced by Walt Disney.