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Microtonal guitar resources

Lots of people like guitars. Lots of people get into microtones. Inexplicably, some people are in both of those categories, and now we have microtonal guitars. The ease with which guitars can be microtonalized is definitely to blame.

Go Fretless!

The most direct way to get microtones, which leaves the most up to your ears. Tried by many, pursued with a dogged obsession with intonation by fewer. Lots of resources out there -- you might start with http://www.unfretted.com/

Refretting

John Starrett FAQ on do-it-yourself fretting - http://infohost.nmt.edu/%7Ejstarret/guitar.html
Buzz Kimball on the same - http://www.nonoctave.com/heroes/buzz/retrofretting.html
Dante Rosati: Adventures in Just Intonation Guitar - http://users.rcn.com/dante.interport/justguitar1.html
Metatonal Music/Sword guitars - http://www.metatonalmusic.com/ - microtonal guitar conversions

Practice with refretted guitars:
How to tune a 19edo guitar by ear

Get a new neck!

John Carruthers - http://www.carruthersguitars.com/
Paul Guy - http://www.truetemperament.com/ - curved frets in "true" 12-tET, Bach/Lehman well-temperament, and meantone
Lukas Brunner produces a guitar with removable neck - http://www.brunner-guitars.com/
Ron Sword - http://www.MetatonalMusic.com - Strat and Ibanez necks

Interchangeable Fretboards

Mark Rankin makes magnetic interchangeable fretboards: Mark Rankin 95511@yahoo.com (remove spaces)
Sword Guitars Gallery

Adjustable Frets

A guitar with moveable frets that are split, and thus independent for each string, is perhaps ideal for a musical environment in which the musical scale varies from piece to piece. John Schneider calls his a "Well-Tempered Guitar." Wim Hoogewerf has one too.

Hervé Chouard produces guitars with adjustable frets: http://www.chouard.de/
For the "Adjustable Microtonal Guitar": http://www.tolgahancogulu.com http://www.myspace.com/adjmicrotonalguitar

Quick n Dirty

Main article: Moving the bridge hack
One tack: take a trashy guitar and move the bridge to a different spot. You'll get a (not necessarily close to equal) division of the octave with ~10-15 notes. Dan Stearns has done this, and so has David Finnamore, and more recently Jason Conklin!
Chris Vaisvil's cheap, quick and dirty temporary guitar frets - a great way to try new tunings.

Even quicker (and maybe less dirty): open tunings

An even simpler idea, without a modification of the guitar being necessary, are open tunings. See this thread on the Yahoo MakeMicroMusic list and
this article on the Yahoo tuning list for some possibilities. This is especially suitable for supersets of 12edo.

A concrete description of an open guitar tuning for 24edo can be found on muzicforums.com (also reachable from the above thread).

The Tritare

The Tritare, developed by folks in New Brunswick, Canada, seems to be fretted to a normal 12, but because it features 3-string groups the sound is FM-like and inescapably xenharmonic. Or is it? See this Science News article.

List of Microtonal Guitarists

Seth Austen (New England) - http://www.sethausten.com/
David Beardsley (NYC) - http://www.biink.com/db/
Jon Catler (NYC) - http://www.microtones.com/bios_jc.htm
Tolgahan Çoğulu (Turkey) - http://www.tolgahancogulu.com
Paul Erlich (Boston) - http://www.stretch-music.com/paulerlich.htm
David 'Fuze" Fiuczynski (Boston?) - http://www.torsos.com/
Fabrizio Fulvio Fausto Fiale (Italy) - http://www.webalice.it/tetraf/
John Gzowski (Canada) - http://www.johngzowski.com/home.html
Jurica Jelic (Croatia) - http://www.juricajelic.org/
Neil Haverstick (Denver) - http://www.microstick.net/
Killick Hinds (Athens, GA) - http://www.killick.me
Wim Hoogewerf (France) - http://www.xs4all.nl/%7Ehuygensf/english/hoogewerf.html
Sten Hostfalt (NYC) - http://www.stenhostfalt.com/
Marc Jones (NYC)
Buzz Kimball (New Hampshire) - http://home.comcast.net/%7Egregmcleod/novosonic.html
Damian Law (Northampton, UK) - http://www.hardcoreguitar.com
Charles Lucy (London) - http://www.lucytune.com/
Philippe Poisson (Montreal, Quebec) - GuitareRiveSud.com
Pete McRae (Philadelphia, PA) - http://www.soundclick.com/bands/pageartist.cfm?bandID=479788
Chris Morda (Seattle) - http://www.stonecrazybluesband.com/pages/bios/chris.html
Chris Mosley (Portland) - http://www.chrismosley.com/
Rod Poole (LA) (d.2007) - http://www.biink.com/poole/index.htm
Nadaka (India) - http://www.nadaka.com/french/raga-guitar.html
Jean-Pierre Poulin (France) - http://www.jeanpierrepoulin.com/Guitare.htm
Dante Rosati (NYC) - http://www.danterosati.com/
Paul Rubenstein (NYC) - http://www.ubertar.com/
James Sanger (Barneville-Carteret, France) - http://www.myspace.com/jamessanger
John Schneider (Los Angeles) - http://www.piercecollege.edu/departments/music/facultyStaffFiles/schneider.html
Drew Skyfire???
Ron Sword (USA) - http://therealronsword.blogspot.com
Onoue Torigoya (Japan) - http://torigoya.main.jp/en_index.html
Anders Thidell (Sweden) - http://www.furious.com/perfect/truetemperament.html
Siemen Terpstra (Nederland) - http://www.huygens-fokker.org/docs/terpgit.html
Chris Vaisvil (Indianapolis) fretless, microtonal Roland GR-20 guitar synthesizer Music & Techniques by Chris Vaisvil
Roberto de Vittorio (Argentina) - http://www.ciweb.com.ar/RDV/microtonal_guitar.php

Forums

www.microtonalguitarist.com - A guitar forum specifically for microtonal guitar

Additional Links of Interest

picture gallery, Aaron Hunt - http://www.h-pi.com/eop-guitars.html
LucyTuning a guitar - http://www.lucytune.com/guitars_and_frets/frets.html
A Guitar in 10-EDO - http://albertorojo.com/DecaphonicGuitar/
A Guitar in 16-EDO - http://www.armodue.com/schedatecnica.htm
A Guitar in 17-EDO (Charles Loli) - http://microtonalismo.com
A Guitar in 23-EDO (Tútim Dennsuul) - Ksenthings
Theorie de la musique (French Site) - TheorieMusicale.com
A recent microtonal guitar festival in Seattle - http://www.microtonalguitar.com/
A fretless guitar festival in New York - http://www.fretlessguitarfestival.com/