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One of this composer's operatic compositions includes an Act One flute duet during a pantomime between a lady and a cavalier whom the title jeweler kills for a piece of gold. His Craft of Musical Composition illustrates opposition to the twelve-tone school, preferring instead "music for use." In addition to Cardillac, this composer wrote both libretto and music for an opera that includes Gregorian chants in its "Concert of the Angels" Prelude before covering the Peasants' Revolt. For 10 points, name this German composer of an operatic life of Matthias Grünewald, Mathis der Maler.
One of this composer's operatic compositions includes an Act One flute duet during a pantomime between a lady and a cavalier whom the title jeweler kills for a piece of gold.
Paul {Hindemith}