Musical interval spanning five staff positions and seven semitones, whose frequency ratio is approximately 3:2=1.5 (in equal temperament, ¹²√2⁷=1.498…)
The duo centred their writing on the harmonic perfectfifth, something A Minor Fifth Is Made Of Phantoms references.
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Probably the most primitive harmony was a perfectfifth resulting from the attempt of men with different ranges to sing together.
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Proposition III deals with the perfectfifth, showing the result from a series of twelve perfect fifths employed within the space of an octave.
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II, following, demonstrating the result of dividing the octave into four minor thirds, and Proposition III, demonstrating the result of twelve perfectfifths.
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The device, or perhaps the willow-wisp, made a sound like voices singing in chorus, arranged in perfectfifths, wandering slowly up and down an octave.