 In 14 string quartets, three string quintets, two piano quartets, a string sextet, four piano trios, and numerous other chamber compositions, Dvořák incorporates folk music and modes as an integral part of his compositions.For example, in the piano quintet in A major, Op.81, the slow movement is a Dumka, a Slavic folk ballad that alternates between a slow expressive song and a fast dance.