Turkish pianist and composer Fazil Say performs Mozart’s sophisticated Piano Concerto No. 21 and his own Silk Road, an engrossing piano concerto inspired by folk music found along the ancient trade route from China to Europe. In the overture to La Scala di Seta, Rossini dishes out humor related to a silk ladder and its role in an operatic love triangle. Haydn’s Symphony No. 83 earned its nickname, “The Hen,” from its fits of lighthearted clucking.