Copland's work in the late 1940s and 1950s included use of Schoenberg's twelve-tone system, a development that he had recognized but not fully embraced. He had also believed the atonality of serialized music to run counter to his desire to reach a wide audience. Copland therefore approached dodecaphony with some initial skepticism. While in Europe in 1949, he heard a number of serial works but did not admire much of it because "so often it seemed that individuality was sacrificed to the method". The music of French composer Pierre Boulez showed Copland that the technique could be separated from the "old Wagnerian" aesthetic with which he had associated it previously. Subsequent exposure to the late music of Austrian composer Anton Webern and twelve-tone pieces by Swiss composer Frank Martin and Italian composer Luigi Dallapiccola strengthened this opinion.