Tracing the roots of the piano to the very beginning of consciousness, when man first became aware of sound.
Érard built his first five-octave bichord piano (presumably based on the Zumpe Square) for the Duchesse de Villeroy.
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- Macnutt, Richard. "Erard." Oxford Music Online. Oxford University Press, 2007 – 2015. Web. 14 Sept. 2015.