Describe Hildegard of Bingen.
Hildegard was one of the most creative and many-sided personalities of the Middle Ages. A visionary and mystic, she was active in religious and diplomatic affairs. She also wrote poetry and music; treatises on theology, science, and medicine; and a musical drama, Ordo virtutum (Play of the Virtues), which is the earliest known morality play. She was the first woman composer from whom a large number of works—monophonic sacred songs—have survived.