LucyScale Developments - LucyTuning is a microtonal system derived from pi, and the writings of John 'Longitude' Harrison. R. L. Reid's Notes on Microtonal Composition - Sound files and an introduction to the 43 tone scale. Lucy Tuning - Lucy Tuning is a microtonal music system derived from pi and the writings of John Harrison. American Festival of Microtonal Music - The AFMM produces and commissions works which use pitches and musical scales which are not organized in the standard twelve tone to the octave equally tempered way. Dictionary of Microtonal Music Theory - Dictionary of common terms used in just tuning and equal temperament style tunings. FreeNote Music: Microtonal Guitars & Recordings - Microtonal instruments, recordings and books. Julian Carrillo and the Thirteenth Sound - Mexican music creator of microtonal system called the 13th Sound. Huygens-Fokker Foundation - Center for microtonal music. Promotes microtonal music in all its forms. In English and Dutch. World Harmony Project - A website about microtonal tuning and related musical instruments. Micotronalismo - Classical Guitar music in 17-Tone Equal Temperament composed by Charles Loli.