When we explore Medieval music, we are dealing with the longest and most distant period of musical history. It includes the Gregorian chant. Gregorian chant is monophonic, meaning music that consists of only one melodic line without accompaniment. Polyphony, music where two or more melodic lines are heard simultaneously, did not exist (or was not knotted) until the 11th century. Unlike chant, polyphony required the participation of a composer to combine the melodic lines in a pleasing manner. I don’t know much about this period because I don’t like this kind of music.