An exciting evening with the Orpheus Chamber Orchestra honors the legacy of conductor Andre Kostelanetz, a champion for a remarkable range of American composers that included Aaron Copland, William Schuman and Jerome Kern. The opener is a new Library commission for film and concert composer Danny Elfman, a bow to Kostelanetz’s influential programs juxtaposing popular and classical music. “My greatest pleasure is when I can surprise the audience with my music,” writes Elfman, whose work includes scores for over 100 films and recent commissions from the London Philharmonic and San Francisco Symphony. The young American violinist Chad Hoopes plays the Mendelssohn concerto, before Jannina Norpoth’s fresh, imaginative arrangement of Mussorgsky’s Pictures at an Exhibition gives the virtuosic Orpheus musicians a special moment to shine.