He played in clubs from the age of twelve but completed high school before taking a job playing with the St. Louis Symphonette .
Davis began his musical apprenticeship under Seymour Rosenfeld , who was a long - time trumpet player with the Philadelphia Orchestra .
Davis played in clubs from the age of twelve but completed high school before taking a job playing with the St. Louis Symphonette .
Davis began his musical apprenticeship under Seymour Rosenfeld , who was a long - time trumpet player with the Philadelphia Orchestra .