Maestro explores the life and legacy of Leonard Bernstein, the legendary American conductor, composer, and musician. The film delves into Bernstein's complex personal relationships, particularly his marriage to Felicia Montealegre, and his groundbreaking contributions to the world of music, including his famous work as the composer of West Side Story. Through a biographical lens, Maestro portrays the emotional and artistic highs and lows of Bernstein’s life, shedding light on his passionate personality and the challenges he faced both in his career and personal life.