Gian Carlo Menotti is frequently considered to be the greatest composer of American opera in the twentieth century. The Missa O Pulchritudo uses the Roman Catholic text for the Mass except for the Credo, which is replaced by a Motet based on the words of St. Augustine. There is some occasional part-splitting in the chorus. This is the Schirmer Edition of the vocal score and includes a Piano reduction of the orchestral accompaniment. (These orchestral parts are available on rental from G. Schirmer).