There are two main categories of medieval music: polyphonic religious music and secular works with monophonic elements.
Religious music is church music, and its main forms are singing hymns and reciting the Bible. Psalms were the main form of religious music in the Middle Ages.
The most important representatives of the long Middle Ages were Gregorian Chant (probably around the 10th century, slightly earlier than the Middle Ages) and Ambrosius. Gregorian chant made a huge contribution to music and was the beginning of the study of classical music in general, but importantly now we can also hear medieval chant.
One of the more important representatives of polyphonic music is Organum, who clearly shows the characteristics of the Gothic style.
There are many later religious composers, the more famous ones are Palestrina, La suze and so on.
Performers of secular works can also be said to be the troubadours we often mention. Troubadours were popular among the nobility, even emperors. However, there are also artists who come from poor backgrounds and enter the upper class because of their outstanding talents. There is very little information left in this area. For secular music earlier than the 11th and 12th centuries, there is almost no accurate notation to record that music. The oldest surviving secular music are songs with Latin lyrics. Among them are Goliard's Songbook, Roland's Song and other important works. The most popular classical music nowadays, Burana Burana, can also be regarded as a representative of medieval secular music.