The Indefinite pitch reference article from the English Wikipedia on 24-Apr-2004 (provided by Fixed Reference: snapshots of Wikipedia from wikipedia.org)

Indefinite pitch

In music a sound or note of indefinite pitch is one of which it is impossible or relatively difficult to discern the pitch or frequency of the fundamental, as opposed to sounds of definite pitch. Sounds with indefinite pitch do not have harmonic spectra or have altered harmonic spectra.

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