Brittney Lohmiller / The Natchez Democrat — Dr. Anatoly Zatin, left and Vlada Vassilieva play “Prelude Rustique Final,” a sonata for piano four-hands, by Francis Poulenc at the Arcade Theater Thursday evening in Ferriday. Dr. Zatin and his wife Vlada Vassilieva are professors at the University of Colima in Mexico and play grand pianos together around the whole as the musical duo “Duo Petrof”.