Most of his early music is chamber music, and includes a Piano Trio and a Piano Quintet; the style is contrapuntal and influenced by Bartók, but looks back to Renaissance and Baroque models as well. In the second style period he wrote the first two of his four symphonies. Although he used twelve-tone technique, he avoided orthodoxy by occasionally using triads and octaves; he also liked to use the row melodically, giving the successive pitches in the same tone color (many other composers of 12-tone music split the row between different voices).