Famous jazz trumpeter Clark Terry spends his life bedridden, suffering from the debilitating effects of diabetes. Consider it this year’s “Rocky” of documentaries: a heartfelt, uplifting tale that celebrates the joy of life and the triumphs of succeeding against all odds. The film stands as a loving tribute to the affable 93-year-old Terry, who performed in the bands of both Count Basie and Duke Ellington and seems to have influenced just about every jazz giant on the planet. At the movie’s core is the relationship between Terry, who is losing his sight, and his latest student, Justin Kauflin, a young, blind piano prodigy who is struggling to launch a career despite his considerable talents.