Medieval music was both sacred and secular. During the earlier medieval period, the liturgical genre, predominantly Gregorian chant, was monophonic. Polyphonic genres began to develop during the high medieval era, becoming prevalent by the later thirteenth and early fourteenth century.
composers-
Hildegard von Bingen- a German Benedictine abbess, writer, composer, philosopher, Christian mystic, visionary, and polymath. She is considered to be the founder of scientific natural history in Germany.
John Dunstable- an English composer of polyphonic music of the late medieval era and early Renaissance periods. He was one of the most famous composers active in the early 15th century, a near-contemporary of Leonel Power, and was widely influential, not only in England but on the continent, especially in the developing style of the Burgundian School.
Giovanni Pierluigi da Palestrina- an Italian Renaissance composer of sacred music and the best-known 16th-century representative of the Roman School of musical composition. He had a lasting influence on the development of church music, and his work is considered as the culmination of Renaissance polyphony.