Salad days (1963)

Jane and Tim meet in a park, soon after their graduation, to plan their lives. They agree to get married, but in secret from Tim's domineering and ambitious parents. Tim promises to take the first job that he is offered. A passing tramp asks them to look after his mobile piano for a month, and they soon discover that the piano gives everyone within earshot an irresistible desire to dance. When the tramp reappears to take back the piano, he also reveals that he is a hitherto unknown uncle of Tim's. TV adaptation of Slade and Reynold's 1954 Westend musical.