1970 Original Mastered By Robert Ludwig At Sterling Sound. Appears Unplayed. Recorded April 21-23, 1970, Under The Musical Supervision Of The Composer. Quartet No. 1 Received First Prize In The Concours International De Quatuor, Liège, Belgium, 1953. Quartet No. 2 Received The Pulitzer Prize For Music, 1960; New York Music Critics Circle Award, 1960; International Rostrum Of Composers Award (UNESCO), Paris, 1961.