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It was the first piece with a 4 line staff
Relative pitch and spacing were also key points in this piece -
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Created Polyphony with 6 voices
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It was the first piece with dynamics
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Codified rules for music theory that were used by his contemporaries, and is his most influential piece.
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Created 24 preludes and fugues in every key, and this was the first time all keys were used in an effective way on one instrument. It also standardized Equal Temperament
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