What is the climax of the Sound of Music?

The Von Trapp family compete at the singing festival - they win, their name is called as the winners and they don't appear.. They went backstage and escaped from the Nazis who, upon determining what the family did, chased them through the city. The family hid in the abbey, they almost got away until the ***CLIMAX*** where Rolf catches them hiding and almost doesn't blow his whistle, then the father tells him that he could never be "one of them" - <ta da> Rolf blows the whistle and the family runs. The Nazis give chase but the nuns have sabotaged their cars and the chase comes to an end. The Von Trapp's escape is complete.

The crescendo?

"When the fat lady sings."

I guess the beat keeps going on.