Question: So Long, Scarecrow is titled in reference to which 1939 musical fantasy film?
Sentence (from "The Wizard of Oz (1939 film)"): It stars Judy Garland as Dorothy Gale, alongside Ray Bolger, Jack Haley, Bert Lahr, Frank Morgan, Billie Burke and Margaret Hamilton, with Charley Grapewin, Pat Walshe and Clara Blandick, Terry (billed as Toto), and the Singer Midgets as the Munchkins.
Relevant evidence: No