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7Historical side note: Leonard Euler lived at the court of King Frederick the Great, King of Prussia, in Potsdam for 25 years (as did Voltaire and La Mettrie). This is the same King Frederick that took flute lessons from Joachim Quantz and who bought 15 newfangled “piano-fortes” (better known to us as a “piano”) from Silbermann because he thought that this new instrument showed some promise. However, King Frederick’s most important contribution to the history of music is that he composed the theme that J.S. Bach used to create the “Musikalisches Opfer” or “Musical Offering.”