Piano reduction with solo part. Bela Bartok's Viola Concerto was left incomplete at the time of the composer's death in 1945. In 1949, violist William Primrose premiered the Tibor Serly version of this work, which has become a mainstay of the repertoire. The revised version, prepared by Peter Bartok and Nelson Dellamaggiore, offers performers the closest possible representation of the work as left  by the composer.