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"Galileo Galilei" is Glass' 18th opera, and draws from letters of Galileo and his family, and various other documents, to retrospectively journey through Galileo's life. Opening with him as an old, blind man after the trial and Inquisition for his heresy, it explores his religiosity as well as his break with the church, and expands into the greater, oscillating relationship of science to both religion and art. It reaches its end with Galileo — as a young boy — watching an opera composed by his father, Vincenzo Galilei, who was a member of the Florentine Camerata, an association of artists who are credited with creating the art form that came to be known as opera. Ironically, his father's opera is about the motions of the celestial bodies.