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[[Image:Lesser septimal tritone on C.png|thumb|right|Lesser septimal tritone on C<ref name="Fonville">Fonville, John. "Ben Johnston's Extended Just Intonation- A Guide for Interpreters", p.121-122, ''Perspectives of New Music'', Vol. 29, No. 2 (Summer, 1991), pp. 106-137.</ref> {{audio|Lesser septimal tritone on C.mid|Play 7:5}}.]]
[[Image:Greater septimal tritone on C.png|thumb|right|Greater septimal tritone on C<ref name="Fonville"/> {{audio|Greater septimal tritone on C.mid|Play 10:7}}.]]
The '''tritone''' ({{Audio|Tritone on C.mid|Play}}, ''[[tri]]-'' "three" and ''[[Pitch (music)|tone]]'') is a [[musical interval]] that spans three [[major second|whole tones]]. The tritone is the same as an '''augmented fourth''', which in [[equal temperament|12-tone equal temperament]] is the [[enharmonic]] equivalent of a '''diminished fifth'''. It is often used as the main interval of [[Consonance and dissonance|dissonance]] in [[Western world|Western]] harmony, and is important in the study of musical [[harmony]]. "Any tendency for a [[tonality]] to emerge may be avoided by introducing a note three whole tones distant from the key note of that tonality."<ref>▼
The '''tritone''' ({{Audio|Tritone on C.mid|Play}}, ''[[tri]]-'' "three" and ''[[Pitch (music)|tone]]'') is a [[musical interval]] that spans three [[major second|whole tones]]. It is the same as an '''augmented fourth''', which in [[equal temperament|12-tone equal temperament]] is the [[enharmonic]] equivalent of a '''diminished fifth'''. The augmented fourth and diminished fifth are the interval(s) produced by the [[augmentation (music)|augmentation]] and [[diminution]], or widening and narrowing by one [[semitone]], of the [[perfect fourth]] and [[Perfect fifth|fifth]], respectively.<ref>Benward & Saker (2003). ''Music: In Theory and Practice, Vol. I'', p.54. ISBN 978-0-07-294262-0.</ref> The tritone is also sometimes called a '''tritonus''', the name used in German.
▲The
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== Size in different tuning systems ==
▲The augmented fourth and diminished fifth are the interval(s) produced by the [[augmentation (music)|augmentation]] and [[diminution]], or widening and narrowing by one-[[half step]], of the perfect fourth and fifth, respectively.<ref>Benward & Saker (2003). ''Music: In Theory and Practice, Vol. I'', p.54. ISBN 978-0-07-294262-0.</ref>
Writers often use the term ''tritone'' to mean specifically half an octave from a given tone, without regard to the original meaning or what system of tuning it may belong to. Context may resolve it to more an augmented fourth, a diminished fifth, or a "neutral" interval with no clear diatonic relationship. In almost all tuning systems besides 12 equal temperament, the augmented fourth and diminished fifth do not have the same size.
The half-octave tritone is unique in being equal to its own
Two tritones add up to six whole tones, which in meantone temperament is a [[diesis]] less than an octave, but in equal temperament, where the diesis is tempered out, it is equal to a [[octave|perfect octave]]. The half-octave tritone interval is used in the musical/auditory illusion known as the [[tritone paradox]].
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