Answer:
Medieval music is characterized by modal tonality.
Step-by-step explanation:
Broadly speaking, in the West, the music of antiquity (Greece and Rome), the music of the Middle Ages and the music of the Renaissance are totally modal. The hallmark of this western modal music is Christian Gregorian chant, but this modal music is also present in all popular music and in all profane medieval and renaissance music, including, for example, troubadourism.