Scottish composer James Macmillan has made a magical cocktail of Celtic folk music, rhythmic intensity, social conscience, and Catholic faith to become one of the leading composers of our time. Conductor David Danzmayr contrasts two of his works with Mendelssohn's fiery and majestic Reformation Symphony. The Atlanta Symphony Orchestra offers an 18th-century version of musical fire in Mozart's Piano Concerto No. 20 with the Palestinian-Israeli pianist Saleem Ashkar, music director of the Galilee Chamber Orchestra.