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  This treatise set the foundation for how we read music today, more specifically musical rhythm. Believed to have been written by Philippe de Vitry
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  This mass was very well known for the way the voices interacted with each other. It's one of the big pieces that came from the Renaissance.
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  The motet was published in 1572, but the entire mass came 20 years later.
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  The importance of this piece comes from the fact that it actually specified whether a passage should be loud or soft (as the name implies).