What are the 7 visual elements of art?

Nthe documentary, michael tilson thomas suggests beethoven's overall message in this symphony by stating, "things happen to us in life we can never get over, but it's ok to know that, recognize that and by confessing that easily and generously we perhaps become the biggest possible we can be."

Opera combines music with which of the following

I’m a paragraph of no less than 125 words, explain the single most important factor involved in advancing american classical music in the twentieth century.