It begins softly. A single snare drum. Then, a flute. Gradually, each instrument of the Pittsburgh Symphony joins in. One after the other. Until Ravel’s “Bolero” reaches one of the greatest climaxes in all of music. Also, Seong-Jin Cho, the First Prize winner of the International Chopin Competition, plays Liszt’s blistering Second Piano Concerto. “Unequivocally brilliant,” says The Telegraph of Seong-Jin Cho. And Bartok’s dazzling Concerto for Orchestra will showcase the virtuosity of the Pittsburgh Symphony under Music Director Manfred Honeck.