A pair of superstars shares the Symphony Center stage. Leonidas Kavakos, “a commanding presence onstage” (The New York Times), teams up with CSO Artist-in-Residence Daniil Trifonov, “one of the most spectacularly virtuosic pianists of the day” (The New York Times), for a program that spans the restless outpourings of Beethoven and Brahms to the 20th-century fireworks of Poulenc and Bartók.