Pittsburgh Symphony Orchestra is starting a cycle of the works of Russian musician Sergei Rachmaninoff by showcasing two masterful soloists. The Thanksgiving weekend’s headlining piece is the Russian romantic’s most famous work, “Rhapsody on a Theme of Paganini.” The rhapsody builds itself through different themes, including variations on violin melodies and portions of a requiem mass. Pianist George Li will perform with the symphony for the first time as a soloist during Rachmaninoff’s rhapsody. The symphony’s principal oboe Cynthia Koledo DeAlmeida will take center stage as a soloist when the symphony debuts Mozart’s "Oboe Concerto." In addition to the two pieces debuting this weekend, the symphony will continue its tradition started by PSO conductor Manfred Honeck and perform Viennese waltzes and polkas to round out the show.