Difference Tone Training from PSYCHE, an official journal of the association for the scientific study of consciousness

Pitch, Temperament & Timbre-from Music Theory Online

New Sounds-World Out Of Tune-Show #2331-Jon Catler talks about the 2006 Out Of Tune Festival

Conductor Christopher Morris Whiting supplies this treatise on Hearing of Intonation

The Huygens-Fokker Foundation has a very long list of Microtonal Music on CD

Algorithms for Mapping Diatonic Keyboard Tunings and Temperaments from Music Theory Online

The Develpment of Western Tuning Systems and the Contemporary Use of Extended Just Intonation-Reseach by Momilani Ramsturm

Medieval Music Theory from Midicode

Primer on Math and Music from the Math Mistakes Website

Let there be Harmony, A basic microtonal course for guitarists by Tommi Ilmonen

A Tour Up the Harmonic Series from David Canright

Dave Keenan has an article on Optimising JI guitar designs using linear microtemperaments

The Mathematics of Tuning and Temperament from Accoustics, Music, and Sound

Arno Lambert has some Microtonal Guitar info at his site on featuring “original, not common musical instrument/sculputers/musical interfaces”

Guitar Player article on Just Intonation for Standard Guitar