Last year in celebration of the 150th anniversary of Rachmaninoff’s birth, the two pianists Daniil Trifonov and Sergei Babayan performed a joint concert at the Vienna Konzerthaus. The program included the Russian composer’s two Suites for two pianos and the bold, vibrant two-piano version of his Symphonic Dances. Babayan acknowledges Rachmaninoff as a genius both as a composer and as a pianist: “When he writes for two players and two pianos, we mortals have the chance to experience how he played on just one piano.”