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Guido of Arezzo created the four line staff, the idea of relative pitch, and the first accidentals, which were the round(flat) b and square(natural)b. This all came from the publication of his treatise, from which all these things and his hexachord system and sight singing syllables came to be.
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Ars nova, or "new art" arose in France in 1323 and replaced the Ars antiqua, or "old art". With the rise of Ars nova came the groundwork for modern notation, as well as a new note value, the "minim". During the time of Ars nova, music was starting to be divided into duple and triple meter.
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This mass was not only dedicated to the pope, but demonstrated that sacred words could be intelligible in polyphonic music with six voices, which was then thought not possible.
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Gabrieli's Sonata pian' e forte was originally created for use at St. Mark's Basilica in Venice, Italy. This piece was not only the first in history to specify what instrument played what part, but also was the first piece of music in history to designate dynamics.
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This demonstrates the possibility of playing in all keys on one instrument.
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He is known as a composer and an incredible violinist, but most popularly known as a swordsman. He was known as the black Mozart and it was said that Mozart was jealous. He also became the Music Director of Concert des Amateurs.
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This date was the completion of the first publication
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Shostakovich's Symphony No.5 premiered in St. Petersburg, Russia
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