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Guido of Arezzo's inventions were the 4-line staff, relative pitch, and sight singing. He also invented solfege, and the Hexachord system.
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The important innovation was time in music, noted as perfect or imperfect.
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Legend tells that this piece was written for the Pope to prove that sacred words could be intelligible in polyphonic pieces.
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This piece was composed in the St. Mark's Basilica, and the musical significance was the introduction of dynamics.
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Vivaldi's concertos were all about the new tonality that had come with the Baroque era, and this concerto (translated to "Harmonic Interest") exemplified the new tonality well.
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This piece codified the practices of his contemporaries, and also became the basis for teaching functional harmony. As well, this was the most influential of all theoretical works at the time.
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This was the first collection of pieces written in all 24 keys, which proved that Bach had invented a new, more functional tonality system, known as equal temperament.
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The Concert des Amateurs was one of the finest orchestras in Europe, and Joseph Bologne was a black, virtuoso violinist and composer who led the orchestra.
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