For 10 points, name this 20th century German composer of Symphonic Metamorphosis of Themes by Carl Maria von Weber, who based a symphony off of his opera Mathis der Maler.
This composer included a poem by Holty in a work dedicated to Clelia Gatti-Aldrovandi, his Harp Sonata.  This man wrote a symphony that includes a third movement "Colloquy" that involves offstage violin and viola soloists. This composer of Symphonia Serena also wrote a piece whose second movement uses a "Chinese" flute that repeats a melody eight times and is based off of another composer's incidental music to the play Turandot.  He may be best known for a symphony that whose movements are based off of the (*) Isenheim Altarpiece.  For 10 points, name this 20th century German composer of Symphonic Metamorphosis of Themes by Carl Maria von Weber, who based a symphony off of his opera Mathis der Maler.
This composer included a poem by Holty in a work dedicated to Clelia Gatti-Aldrovandi, his Harp Sonata.  
Paul Hindemith