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.
FreeNote Music: Microtonal Guitars & Recordings: Microtonal instruments, recordings and books.
LucyScale Developments: LucyTuning is a microtonal system derived from pi, and the writings of John 'Longitude' Harrison.
LucyTuning: LucyTuning is a microtonal music system derived from pi and the writings of John Harrison.
Microtonal Music: Microtonal music page with large list of composers, mp3, WAV, MIDI, and Real Audio files of microtonal music.
Microtonal Music on CD: Offers a discography of microtonal, xenharmonic, non-12 tone music (CD only). Contains addresses for record labels, and links to the artists (when available).
R. L. Reid's Notes on Microtonal Composition: Sound files and an introduction to the 43 tone scale.