The addition, subtraction, or other modification of harmonics is a
distortion. That's why the measure of distortion is called Total
Harmonic Distortion.

In slightly more detail (others here may have to excuse the fact that
it's about 40 years or so since I last studied this), it's all about
Fourier analysis. Fourier showed that any periodic wave form with
frequency f could be represented mathematically by the addition of a
possibly infinite series of pure sine waves of frequency f, 2f, 3f
etc, and gave an analytic method for doing this. Thus by Fourier's
Theorem, a recording system, such as vinyl production and playback,
that distorts a periodic waveform must be modifying harmonics.

On Tue, 08 Nov 2011 10:31:56 +0000, Rob wrote:

One way
to explain what that experience is might be the influence of distortion.
Other ways might be harmonics, or the possible a variable that science
has yet to consider/uncover.
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