Hohe Tannen (1960)

Because the muse doesn't want to kiss them in the city, musicians Theo and Bert jet out into the countryside. A bell-like voice from the stables promptly catches their attention. But instead of a fair beauty, they find a dirty stable boy. Amused, they choose him as their servant. The boys have no idea that the boy is Liesel, the charcoal-burner's daughter in disguise.