Who was an outstanding composer of the school of Notre Dame?Multiple ChoiceHildegard of BingenGuillaume de MachautPerotinPope Gregory I

The outstanding composer of the school of Notre Dame from the given options is Perotin.

Perotin (or Pérotin) was a significant figure in the development of polyphony in medieval music and is known for his innovative use of rhythm and harmony, particularly in the context of the Notre Dame school, which emphasized a more structured approach to vocal composition. His works marked an important transition in music history, leading toward the more complex textures found in the later Middle Ages.

While the other figures mentioned—Hildegard of Bingen, Guillaume de Machaut, and Pope Gregory I—are important in their own rights, they are not primarily associated with the school of Notre Dame.