Like Mozart, Maurice Ravel excelled in every genre he touched, and his single string quartet is considered among the greatest composed. And when speaking of favorite quartets, no one would leave out the famous Adagio from Samuel Barber’s 1936 quartet, performed in this program by rising stars of the classical scene, the Viano String Quartet. Charles Martin Loeffler’s recently-discovered octet also provides a unique, American reflection on Ravel’s Introduction and Allegro, also featuring the harp.