The Philadelphia Orchestra and Yannick Nézet-Séguin anchor a wonderfully varied series that includes a Mahler symphony with soprano Pretty Yende and a Mozart concerto with clarinetist Ricardo Morales; a program of Ravel, Clara Schumann, and Price that continues the orchestra’s partnership with Beatrice Rana; star pianist Yuja Wang in an extraordinary, history-making Rachmaninoff event that comprises all four of the composer’s piano concertos as well as his Rhapsody on a Theme of Paganini; and chamber choir The Crossing in a program that features Stravinsky’s The Rite of Spring and a New York premiere by John Luther Adams.