Aaron Copland was a man that had a very specific point of view about what music should be which was that, he felt that new music should have the composer should show a personality in his music.
“At first, I was scared to show fear because you can never be sure how people will perceive you. But I dared myself to do that, to stand out. Now I'll talk about being beaten up or robbed or making a stupid decision because of a girl or whatever.”