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A piano sounds when a key throws a felt hammer against strings, whose vibrations a soundboard amplifies. Cristofori's invention let players vary loudness by touch.
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Jazz grew in New Orleans around the 1890s as African American, Creole, and other musicians blended blues, ragtime, brass band, and dance traditions into an improvised style.
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Twelve notes came from stacking pure fifths, which almost close into a circle after twelve steps, and from the need to play in many keys. Equal temperament made that practical.
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