Ever since Franz Josef Haydn developed the modern version of a string quartet in the mid-18th century, the most daring and innovative practitioners of the art form has to be Béla Bartók. In this special double program, the Shanghai Quartet flexes its musical muscles by performing the complete Bartók quartet cycle. Written over a 30-year span, Bartók’s six quartets stand as a sonic biography of one of the 20th century’s most enigmatic and essential composers.