|Other instruments||Bass guitar|
|Advantages||Closely approximates standard tuning|
|Disadvantages||Difficult to play conventional music, especially barre chords|
|Left-handed tuning||All-fifths tuning|
|Guitarist||Stanley Jordan |
|Jazz musician Stanley Jordan stated that all-fourths tuning "simplifies the fingerboard, making it logical".|
|Regular tunings (semitones)|
|Minor thirds (3)|
|Major thirds (4)|
|All fourths (5)|
|Augmented fourths (6)|
|New standard (7, 3)|
|All fifths (7)|
|Minor sixths (8)|
Among alternative tunings for the guitar, all-fourths tuning is a regular tuning. In contrast, the standard tuning has one irregularity—a major third between the third and second strings—while having perfect fourths between the other successive strings. The standard tuning's irregular major-third is replaced by a perfect fourth in all-fourths tuning, which has the open notes E2-A2-D3-G3-C4-F4.
Among regular tunings, this all-fourths tuning best approximates the standard tuning.
In all guitar tunings, the higher-octave version of a chord can be found by translating a chord by twelve frets higher along the fretboard. In every regular tuning, for example in all-fourths tuning, chords and intervals can be moved also diagonally. For all-fourths tuning, all twelve major chords (in the first or open positions) are generated by two chords, the open F major chord and the D major chord. The regularity of chord-patterns reduces the number of finger positions that need to be memorized. Jazz musician Stanley Jordan plays guitar in all-fourths tuning; he has stated that all-fourths tuning "simplifies the fingerboard, making it logical".
Among all regular tunings, all-fourths tuning E-A-D-G-C-F is the best approximation of standard tuning, which is more popular. An advantage of standard tuning is that it has many six-string chords, unlike all-fourths tuning. All-fourths tuning is traditionally used for the bass guitar; it is also used for the bajo sexto.
Relation with all-fifths tuning
All-fourths tuning is closely related to all-fifths tuning. All-fourths tuning is based on the perfect fourth (five semitones), and all-fifths tuning is based on the perfect fifth (seven semitones). The perfect-fifth and perfect-fourth intervals are inversions of one another, and the chords of all-fourth and all-fifths are paired as inverted chords. Consequently, chord charts for all-fifths tunings may be used for left-handed all-fourths tuning.
- Scordatura, alternative tunings of stringed instruments
- Laúd and bandurria, Spanish six-course plucked string instruments tuned in fourths
- Puerto Rican cuatro, five-course plucked string instrument tuned in fourths
- commons:Category:Perfect fourths tuning charts and diagrams for P4 tuning
- Sethares (2001, p. 52):
Sethares, Bill (2001). "Regular tunings". Alternate tuning guide (PDF). Madison, Wisconsin: University of Wisconsin; Department of Electrical Engineering. pp. 52–67. 2010 Alternate tuning guide, including a revised chapter on regular tunings. Retrieved 19 May 2012.
- Nash (1997)
- Denyer (1992, pp. 158–159)
- Weissman (2006, p. 68)
- Sethares (2001, p. 58)
- Sethares (2001, p. 9)
Ferguson (1986, p. 76):
Ferguson, Jim (1986). "Stanley Jordan". In Casabona, Helen; Belew, Adrian (eds.). New directions in modern guitar. Guitar Player basic library. Hal Leonard Publishing Corporation. pp. 68–76. ISBN 0881884235.
- Allan Holdsworth on All-Fourths Tuning – Streamable, retrieved 16 February 2018
- "The Unreachable Star (Guitar World 1989) – Allan Holdsworth Information Center". fingerprintsweb.net. Retrieved 31 May 2022.
- Sethares (2001, p. 53)
- Denyer, Ralph (1992). "Playing the guitar". The guitar handbook. Special contributors Isaac Guillory and Alastair M. Crawford (Fully revised and updated ed.). London and Sydney: Pan Books. pp. 65–160. ISBN 0-330-32750-X.
- Nash, Paul (1 July 1997). "Guitar in fourths: Guitar tuning with all strings in perfect fourth intervals apart". Guitar Player. NewBay Media LLC. Retrieved 14 October 2012 – via HighBeam Research.[dead link]
- Sethares, William A. (2011). "Alternate tuning guide". Madison, Wisconsin: University of Wisconsin; Department of Electrical Engineering. 2010 PDF version by Bill Sethares. Retrieved 19 May 2012.
- Weissman, Dick (2006). "Other tunings: Fourths tuning". Guitar tunings: A comprehensive guide. Routledge. pp. 68–70. ISBN 9780415974417. LCCN 0415974410.
- Bianco, Bob (1987) . Guitar in fourths: A manual for playing. New York City: Calliope Music. pp. 1–64. ISBN 0-9605912-2-2. OCLC 16526869. republication of A manual for playing the guitar in fourths (Catalona Enterprises, pp. 1–64)
- Law, Ant (2011). 3rd Millennium Guitar: An Introduction to Perfect 4th Tuning. Pacific, MO: Mel Bay Publications. pp. 1–75. ISBN 978-1610659680.
- Bromley, Keith (May 2013). Sixty guitar chords for all-fourths tuning: An introductory tutorial about chords on a guitar tuned to all fourths (PDF). Retrieved 9 November 2013.
- Zhille's guitar blog: Perfect fourths (P4) tuning–Basics and examples
- Lessons and articles on fourths tuning using Eb-Ab-Db-Gb-B-E
- Introduction to All Fourths Tuning + Free PDF Reference Guide
- r/allfourthstuning sub-reddit for all fourths tuning