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The Fourier Theorem states that any Periodic waveform can be Decomposed as the sum of a series of sine waves with frequencies in a Harmonic Series and at specific Phase relationships to each other. Musical Instrument s usually generate Tone s composed of several sinusoidal waves with Harmonic Frequencies . The lowest of these frequencies (the Fundamental Frequency ) determines the Pitch of the tone, which is perceived by the human hearing. In music, Note s are assigned to tones with different fundamental frequencies, in order to describe the pitch of played tones.