Unfaithfully Yours (1948)

In writer/director Preston Sturges' dark and cynical domestic black comedy:

• all three fantasy scenarios (to the music of Rossini, Wagner, and Tchaikovsky) of the proposed way to deal with his allegedly unfaithful, younger and pretty American wife Daphne (Linda Darnell), as self-assured but jealous orchestra conductor/husband Sir Alfred de Carter (Rex Harrison) conducted a symphony
• the slapstick scene of the disastrous, real-murder preparations using Sir Alfred's first fantasy-day dreaming plan, especially with a complex home recording machine
• the final scene of the couple's reconciliation when Sir Alfred at last realized how deliriously silly he had been - he embraced and kissed his loving wife, who had never been unfaithful, and had no idea that he had been plotting against her - as he told her: "A thousand poets dreamed a thousand years. Then you were born, my love"