If we listen two sounds simultaneously with a slight frequency difference (ie, "tone deaf" slightly between them) our ear misses two distinct sounds, but a unique sound that throbs (strengthening and weakening rhythmically).
In these beatings are said to sound beats and if you want to beat you can click on scientifically http://fisicaondemusica.unimore.it/Battimenti.html
The beats are the charm of violin vibrato, and in 'body register "human voice" is obtained by passing the air simultaneously in two tubes are not perfectly tune. Moral: the "dissonance" is the soul of sound.
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