We open up with a shot of the clouds—like, for real, the camera is in the clouds (in a helicopter). The camera then zooms over the hills, and we get some to-die-for aerial shots of the Alps. Finally, the camera tracks in on a woman in the distance.
She's singing the title song while dancing around the hills. Apparently, she goes to the hills when her heart is lonely and listens to the sound of music.
Suddenly, she hears bells in the distance and realizes there's somewhere she needs to be. She grabs her coat off the ground and runs off.
Then we get the titles, laid over shots of Salzburg, Austria, in the "last golden days of the '30s."