Assertion: bassoon's timbre | /r/CapableOf | cancel out even harmonics
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Source sentences:
text: The timbre of a single reed instrument is related to the harmonic series, while the timbre of a double reed instrument includes only the odd harmonics since the two reeds alternately touch each other and separate while vibrating, thus canceling out the even harmonics, and this may be compared to the timbre of a square wave.