Bartok wrote Contrasts in response to a letter of 11th August 1938 from the violinist Joseph Szigeti, telling him that Benny Goodman wanted to commission a trio with solo violin and clarinet. Bartok was by then 57, and had never written a chamber work for a wind instrument. Contrasts is a particularly complex and virtuosic work, and notably requires the clarinettist to switch from a clarinet in A to a B flat instrument for the opening and closing sections of the third movement (similarly the violin has to be retuned in peasant mode to G sharp, D, A, E flat).
The first movement, Verbunkos (Recruiting Dance) is based on a traditional gypsy tune, then the calm of the second, Piheno (Relaxation), is followed by Sebes (Fast Dance), providing a fast and furious conclusion to the work.