Romantic composers delved into the folk music of their countries and a new music emerged. In Ridotto: stellar New York performers are Jennifer Choi, violin; Vasko Dukovski, clarinet; Serafim Smigelskiy, cello and Alexandra Joan, piano, in Bartok’s Contrasts, Schulhoff, Dvorak Bagatelles, Muszynski . Documentary film clips enlighten the listener.