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<p>In 1930-32, the innovative and hard-to-use <a href="page.php?w=Rhythmicon">Rhythmicon</a> was developed by <a href="page.php?w=L%C3%A9on_Theremin">Léon Theremin</a> at the request of <a href="page.php?w=Henry_Cowell">Henry Cowell</a>, who wanted an instrument that could play compositions with multiple <a href="page.php?w=rhythmic_unit">rhythmic patterns</a>, based on the <a href="page.php?w=harmonic_series_%28music%29">overtone series</a>, that were far too hard to perform on existing keyboard instruments. The invention could produce sixteen</p><p>
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