Gregorian chant or sacred chant arose in medieval times. In it, the song is just sung, without instrumental accompaniment.
This type of music was named after St. Gregory, the pope who commanded the Church between 590 and 604. Pope Gregory ordered the deacons to sing only the Gospel. The other musical passages that were part of the mass were in charge of lesser priests.
Continuing his admiration for music, St. Gregory supported the Roman School of Songs in order to train professional singers. In the ninth century, for example, there were already several vocals from Gregorian chants.
