Frogman;
"In the beginning we had the wrong trumpet players, we had those who were classically trained. We had to tell them not to play exactly what was on the score. They started looking at us-at Gil mostly-like we were crazy. They couldn't improvise their way out of a paper bag, so we had to change trumpet players. Like most other classical players, they play only what you put in front of them".
Miles had other disparaging things to see about classical music; he called it "Robot s--t".
These are some of the remarks he made when he was putting "Sketches of Spain" together. Those are Miles Davis's remarks, not mine.