The product is a 3 CD set containing the complete works of composers Anton Webern and Pierre Boulez, performed by artists such as Heather Harper, Charles Rosen, and John Williams. Released in 1991 by Sbme Import, this collection includes compositions from Opus 1 to 31, providing listeners with a comprehensive overview of the two composers' oeuvres. The CDs offer high-quality audio in CD format, making it a valuable addition to any music lover's collection for those interested in the works of Webern and Boulez.