The document summarizes music during the Medieval/Middle Ages period from around 500-1450 CE. It was divided into the Dark Ages from 500-1000 CE where secular music was learned orally and sacred music was preserved with early notated examples. The Late Middle Ages from 1000-1450 CE saw developments in cathedrals, universities, and literature. Gregorian chant dominated sacred music, while secular music included instrumental dances and songs by minstrels, troubadours, and minnesingers. Polyphony began to develop through techniques like organum.