This document provides an overview of music in medieval Europe between 450-1450 AD. It describes the decline of the Roman Empire and rise of the feudal system, with three social classes - nobility, peasantry, and clergy. Gregorian chant dominated church music, while troubadours and minstrels performed secular songs. Polyphonic music emerged in the late medieval period, exemplified by Machaut's complex mass. A variety of instruments accompanied both sacred and secular music. Overall, the document traces the development of music through the Middle Ages.