The revered jazz trumpeter Clark Terry found himself mocked by older musicians when, as a boy in St. Louis, he asked them how to play the magical sounds he’d heard from Duke Ellington. Terry vowed that if he became a pro, he would spend his life teaching jazz to other young people.

Terry, who wound up playing with Ellington himself, kept that promise, as filmmaker Alan Hicks shows in this gentle, loving documentary. The film tracks Terry’s mentorship of young Justin Kauflin, a blind jazz pianist. Terry, who is in his 90s and suffering from advanced diabetes, takes Kauflin under his wing. Together they fight Terry’s precarious health problems, and Kauflin’s debilitating stage fright.

Terry’s talent is so magical that you may wish there were longer snippets of his playing. Still, this is a wonderful portrait of two artists strengthened by friendship.