Andrew, Miles Teller, (The Spectacular Now) a student at a conservatory with his sights on being as great a musician as Charlie Parker, gets mentored by Fletcher, J.K. Simmons, (Law & Order, HBO series Oz) a music teacher who inflicts the vile cruelties, verbal and physical, to get a student to be a legend. No boundaries. Damien Chazelle, the screenwriter, should be nominated for an Oscar along with the stars. See it. You’ll be knee-tapping to the jazz and gasping at the viciousness.