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Below is a partial list of currently-established theories and approaches related to tuning.
  • Just Intonation: The tuning of pitches so that their fundamental frequencies are related by ratios of whole numbers. An infinite world of numerous models: the harmonic series, integer frequency ratios, tonality diamonds, eikosany, Fokker blocks etc.
  • Equal tuning: Tunings that use a single interval (and combinations thereof) to form a subtle monoculture of intervals.
  • Historical Western Temperaments: The (somewhat forgotten) use of meantone tunings and well temperaments in Western common practice music.
  • Musical traditions of indigenous, ancient, and/or non-Western cultures
  • Regular Temperaments: (including Linear Temperaments): a centuries-old practice that has recently undergone a mathematical facelift, in which Just Intonation is selectively and regularly detuned in various ways, to better meet a variety of compositional desires
  • Moment of Symmetry: Tunings (or better, scales) that use iterations of a generating interval, modulo a period interval, to produce scales of two step-sizes.
  • Empirical This is a form of hands-on, field research as opposed to a form of acoustical or scale engineering where tunings are specifically derived from listening and playing experiments carried out in the pitch continuum.
  • Tetrachordal Scales: the use of divided fourths as building blocks for composition.
  • Isoharmonic chords/scales
  • Pretty Pictures that represent scales in one way or another
  • Notation (pretty pictures for a the purpose of writing music down)
  • the notion of a Scalesmith who builds scales, with various methods, perhaps for single occasions
    • Mathematically based scales
    • Acoustically-based scales (resonant frequencies of performance space, for example)
    • Scale transformation and stretching
    • Counter-intuitive, random, arbitrary scales