premise: There Was a Crooked Man... is a 1970 western starring Kirk Douglas and Henry Fonda and directed by Joseph L. Mankiewicz. This was the only western made by Mankiewicz, director of such notable films as "All About Eve", "Guys and Dolls" and "Cleopatra". It was written by David Newman and Robert Benton, their first script after "Bonnie and Clyde".
hypothesis: Guys and Dolls is a musical.
reason: Guys and Dolls is mentioned, but it is not stated what sort of film it is.