Alternate Temperaments: Theory and Philosophy Introduction to tuning systems, based on the cents system. Written by Terry Blackburn. http://www.rdrop.com/users/tblackb/music/temperament/

An Introduction to Historical Tunings On the development of tuning systems in Medieval Europe (Kirnberger, Young, and mean-tone systems). http://home.earthlink.net/~kgann/histune.html

Justonic Tuning Inc. Pitch Palette software tunes a microtunable synthesizer to just intonation, world scales, historic scales and user scales in real time. http://www.justonic.com/

A Beginner's Guide to Temperament Written by Stephen Bicknell for the electronic mailing list Piporg-l. http://www.users.dircon.co.uk/~oneskull/3.6.04.htm

An Atlas of Consonance The author presents a graphical tool for the visualization of consonance and dissonance, based on an acoustical model of the interaction of musical tones. http://www.sohl.com/sohl/mt/maptone.html

Comparison of Temperaments Table comparing various temperaments, including Equal Temperament, Pythagorean, another natural tuning, two mean-tone tunings, two Well temperaments, two Indian tunings, and two Persian tunings. http://www.pcug.org.au/~apurdam/tempers.html

Keyboard temperament analyzer/calculator - Bradley Lehman Excel spreadsheet that analyzes keyboard temperaments: gives beat rates for tuning, and harmonic-tension charts in all keys. http://www-personal.umich.edu/~bpl/temper.html

Tantrum Tool for the study of temperament anomalies. http://www.well.com/user/smalin/tantrum.html

World Scale Depository Construction of a reference center of scale measurements throughout the world. http://www.anaphoria.com/depos.html

Pythagorean Tuning and Medieval Polyphony Article by Margo Schulter. http://www.medieval.org/emfaq/harmony/pyth.html

Historical Tuning Includes information on the differences between equal temperament and well temperament and why Bach rejected equal temperament and celebrated well temperament. http://www.bestweb.net/~rmp

Modes and Scales in Indian Music Article by David Courtney. http://chandrakantha.com/articles/scales.html

Huygens-Fokker Foundation Center for microtonal music. Promotes microtonal music in all its forms http://www.xs4all.nl/~huygensf/english/

Johann Sebastian Bach: Well Tempered Tuning (Wohltemperirt) Paper on the history of the tuning system, as well as information about tuning a harpsichord in this system. http://ha.kellner.bei.t-online.de

The Argument for Equal Temperament Lerdahl's cognitive constraints. http://music.dartmouth.edu/~kov/lerdahl/EqTemp.html

Tuning and Temperament Bibliography Huge list of print books, magazines, and journal articles on tuning systems. http://www.xs4all.nl/%7ehuygensf/doc/bib.html

Understanding Temperaments Tunings used for harpsichords. http://pages.globetrotter.net/roule/temper.htm

Tuning by Ratios This paper explores the use of simple ratios to tune musical intervals and chords. Included are a tutorial, a set of computer programs, and a re-tuned two-part invention by J.S. Bach. http://www.leeds.ac.uk/music/studio/rproj_swss/tuning/tuning.htm

Equal Temperament Tuning An introduction to equal temperament for guitarists who have problems tuning their guitars. http://users.adelphia.net/~cygnusx_1/equal_temperament.html

Julian Carrillo and the Thirteenth Sound (1875-1965), Mexican music creator of the microtonal system called the 13th Sound. He reformed the theory of music, invented a new musical written based in numbers and built instrument capable to produce those small intervals. http://tecweb.tol.itesm.mx/esolisw/julian.html