The music of the Middle Ages was known for Monophonic chant: Monophonic singing, which is established on a single voice or musical line, was prevalent from the very start of the Medieval era.
With this complexity came rhythmic reminder. As time passed, polyphony developed (multiple melodies). In civilizations transiting from Rome to Spain to Ireland, down religious chants—called plainchant or plainsong. Middle ages music originally had no rhythmic form, but as the music became more complex, a need for rhythmic unity developed.
Sacred music was only preferred then. It was the only type of music permitted in churches, so composers held the melodies pure and simple.
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