Continuing the BSO's cycle of music by Dmitri Shostakovich, Music Director Andris Nelsons conducts Rudolf Barshai's string-orchestra arrangement of the composer's Eighth String Quartet, Op. 110 (1960), which the composer suggested was his most autobiographical work. (Barshai was an important conductor and champion of Shostakovich's music; Op. 110a was the first and most important of several arrangements of Shostakovich's string quartets.) Completing the program are Samuel Barber's Medea's Mediation and Dance of Vengeance, a 15-minute concert work excerpted from a 1946 ballet score for the choreographer Martha Graham, and Czech composer Antonín Dvořák's New World Symphony, the most important piece he composed during his years in the U.S., when he was director of the National Conservatory of Music in New York City. The beloved four-movement symphony uses musical elements shared by both North American and Czech folk music