Auditions (or placements) take place during the first two weeks of the year - during zero period. Come check it out if you are interested. It's a friendly process. We work through some audition music as a group for a few days, and then meet as sections to work through placements after people are generally comfortable with the materials.
After auditions are over, rosters are announced.
Thereafter, players can "challenge" into higher placements after each major performance unit. Just let Mr. Thomas know who you would like to challenge with a few weeks notice. New students who wish to join the jazz program after auditions are over just need to talk to Mr. Thomas; he will help you get started.