96.  According to Sethares there is a specific and direct connection between the particular spectrality of the instruments and the related particular scalar structure of the tuning systems employed in the music of most cultures in the world. He describes the perceptual basis for this assertion. (Further discussion follows in Chapter 6.1.) William Sethares, Tuning, Timbre, Spectrum, Scale, (New York: Springer, 2004), p.69.