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Sound is the wave created by a vibrating object that is transported through a medium like
air. When produced as music, vibrations have rhythm. Though not necessarily equal to hear
audible sound, the deaf and hearing impaired can feel vibrations and enjoy music. When
a cello string is played, a standing wave pattern is formed by the vibrations. The resulting
frequencies are known as "HARMONICS" which can which can be changed by varying
the tension, the string length or the linear density by shifting to a string
with a different thickness. The lowest frequency, or fundamental frequency, occurs when the
string length equals one half wavelength. The second harmonic is produced by holding
the string down in the middle. The length of the string equals one wavelength. The third
harmonic is produced by compressing the string such that the length of the string equals
one and a half wavelengths. For all musical instruments the harmonic frequencies are related
to each other by whole number ratios. There is a fundamental relationship between wave
speed, frequency, and wavelength. Musical compositions produce a sound wave with a mixture
of harmonics. Because of these amazing physics principles anyone can express them self through
music.