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» 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.    http://www.afmm.org/

» FreeNote Music: Microtonal Guitars & Recordings    Microtonal instruments, recordings and books.    http://microtones.com/

» Huygens-Fokker Foundation    Center for microtonal music. Promotes microtonal music in all its forms. In English and Dutch.    http://www.xs4all.nl/~huygensf/english/index.html

» Julian Carrillo and the Thirteenth Sound    Mexican music creator of microtonal system called the 13th Sound. In English and Spanish.    http://paginas.tol.itesm.mx/campus/L00280370/julian.html

» Lucy Tuning    Lucy Tuning is a microtonal music system derived from pi and the writings of John Harrison.    http://www.lucytune.com/

» LucyScale Developments    LucyTuning is a microtonal system derived from pi, and the writings of John 'Longitude' Harrison.    http://www.harmonics.com/lucy/

» Microtonal Music    Microtonal music page with large list of composers, mp3, WAV, MIDI, and Real Audio files of microtonal music.    http://infohost.nmt.edu/~jstarret/microtone.html

» Microtonal Music on CD    Offers a discography of microtonal, xenharmonic, non-12 tone music. Includes addresses for record labels, and links to the artists.    http://www.xs4all.nl/~huygensf/doc/discs.html

» R. L. Reid's Notes on Microtonal Composition    Sound files and an introduction to the 43 tone scale.    http://www.rreid.net/tuning/tuning.html