Answer
Hindemith composed Mathis der Maler in 1938. It is a three-act opera based on the life of the 16th-century German painter Matthias Grünewald. The opera is set in Germany during the Protestant Reformation, and it explores themes of faith, art, and politics. Mathis der Maler is considered to be one of Hindemith's most important works, and it is frequently performed today.