The document summarizes the history of music during the Middle Ages, which spanned from around 450 to 1453 CE. It was divided into four periods: Early Christian, Romanesque, Gothic, and Ars Nova. Monasteries served as centers of scholarship and learning, and divine offices involving singing, prayer, and scripture reading took place eight times daily. The two most important periods were Ars Antiqua from 1250-1320 CE and Ars Nova from 1320-1400 CE, which saw a shift from religious to more secular compositions and the development of notation. Troubadours and other wandering performers helped spread secular music orally.