Ukrainian-born pianist Inna Faliks and Yehuda Hanani present a program rich in Russian lore, Slavic emotionalism, Soviet-era sarcasm, and dazzling virtuosity: the cello/piano sonatas by Rachmaninoff, Prokofiev, and Scriabin’s Sonata No. 5, which pianist Sviatoslav Richter considered the most difficult piece in the entire piano repertory. Rachmaninoff’s sonata is passionate and emotionally torrential, a survivor from the 19th century. Prokofiev, on the other hand, dubbed “bad boy of Russian music” by the establishment for his earlier avant-garde style, has written here a work that is mellow and reflective.