Conversation so far:
where in austria was the sound of music filmed
Some of the external scenes for Sound of Music were filmed in Salzburg, Austria.
who were the big actors in the movie The Sound of Music
The two big stars in The Sound of Music are Julie Andrews and Christopher Plummer.
how was the movie The Sound of Music first released
The film A Sound of Music was released on March 2, 1965, in the United States, initially as a limited roadshow theatrical release.
did the movie The Sound of Music win any academy awards
The Sound of Music received five Academy Awards, including Best Picture and Best Director.

Question: who is the main character of the story
Self-contained rewrite: who is the main character of the story in The Sound of Music