American-born pianist Ann Schein, in commemoration of her 1980 Alice Tully Hall Chopin series, returns to the Key Pianists Series in Weill Recital Hall. The all-Chopin program includes the composer’s Polonaise-fantaisie, Nocturne in E-flat Major, Sonata No. 2 in B-flat Minor, and the Op. 28 Preludes.