The Sound of Music is a 1965 musical film based on the booked The Story of the Trapp Family Singers by Maria von Trapp.
Maria (Julie Andrews) is a nun who has been called to be a governess for the seven children of the widowed Captain. The children (Liesl, Friedrich, Louisa, Kurt, Brigitta, Marta, and Gretl) have been known to hostile to previous governesses, but Maria wins them over when she takes them away for a day and teaches them about music and singing.
During this time, the Captain is seeing Baroness Elsa and is set to marry her that summer. However, she does not get along well with the children and the Captain and Maria's affection for each other cannot be unseen and Elsa eventually leaves the picture.
The Captain is then called back to the serve in the military, but delays this by attending the Salzburg Music Festival where the von Trapp family is performing. During the closing of this performance, the Captain, his seven children and Maria flee Austria to Switzerland.