To expound on Berstein's "nyah-nyah..." thing, these 3 tones are the first three non-octave harmonics (removing duplicate octaves). i.e. G E (Bb). The Bb is actually a microtone not in the chromatic scale, but it is the actual interval used in the nyah-nyah.
Also, the 12 step chromatic scale comes from the circle of fifths. The circle uses fifths because it is the dominant. It is the dominant because it is the first non-octave harmonic, thus the strongest.
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