The composer's friend Vladimir Wilshaw noticed this compositional change continuing in the early 1930s, with a difference between the sometimes very extroverted Op. 39 Études-Tableaux (the composer had broken a string on the piano at one performance) and the "Variations on a Theme of Corelli" (Op. 42, 1931). The variations show an even greater textural clarity than in the Op. 38 songs, combined with a more abrasive use of chromatic harmony and a new rhythmic incisiveness. This would be characteristic of all his later works—the Piano Concerto (Op. 40, 1926) is composed in a more emotionally introverted style, with a greater clarity of texture. Nevertheless, some of his most beautiful (nostalgic and melancholy) melodies occur in the Third Symphony, "Rhapsody on a Theme of Paganini", and "Symphonic Dances".