Béla Bartók was a Hungarian composer who lived March 25, 1981-September 26, 1945. His compositions were based on native folk music. He used harmonies of polytonality, polymodality, chromaticism, clusters, planing and intervallic parallelism.
In this example of the “Song of the Harvest” which is violin duet number 33 of 44, he uses polymodal chromaticism, with the 1st violin starting in A Aeolian and the 2nd violin starting in D# minor. Then the next section starts in D Dorian, and then G# Dorian.