Since the mid -nineteenth century, scientists identified the principles of dissonance. Jean-Pierre Dalmont, specialist in acoustic wave guides and music instruments at the University of Le Mans explains how it works.
If it often happens that we perceive in several circumstances that some people, even alone, sing false, it is because they move away a lot from the expected musical scale. To fix the ideas, if in a melody, the expected note is 3 (in the middle of the keyboard), its frequency must be around 440 Hz, that is, the oscillations of 440 per second.
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