http://www.afmm.org/ 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://microtones.com Microtonal instruments, recordings and books. http://infohost.nmt.edu/~jstarret/microtone.html Microtonal music page with large list of composers, mp3, WAV, MIDI, and Real Audio files of microtonal music. http://www.xs4all.nl/~huygensf/doc/discs.html Excellent discography of microtonal / xenharmonic / non-12 tone music (CD only). Contains addresses for record labels, and links to the artists (when available). http://www.harmonics.com/lucy/ LucyTuning is a microtonal system derived from pi, and the writings of John 'Longitude' Harrison. http://m759.freeservers.com/natural.html Argues that the 34-tone equal-temperament scale is the most "natural" equal-temperament scale with fewer than 53 tones. http://www.rreid.net/tuning/tuning.html Notes on microtonal composition, with sound files and an introduction to the 43 tone scale.