Diminished triad

diminished triad
Component intervals from root
	diminished fifth (tritone)
	minor third
	root
Tuning
	45:54:64; 54:45=6:5 & 64:45
Forte no. / Complement
	3-10 / 9-10

In music theory, a diminished triad is a triad consisting of two minor thirds above the root.^[3] It is a minor triad with a lowered (flattened) fifth. When using chord symbols, it may be indicated by the symbols "dim", "^o", "m^♭5", or "MI^(♭5)".^[4] However, in most popular-music chord books, the symbol "dim" or "^o" represents a diminished seventh chord (a four-tone chord), which in some modern jazz books and music theory books is represented by the "dim7" or "^o⁷" symbols.

For example, the diminished triad built on B, written as B^o, has pitches B-D-F:

${ \omit Score.TimeSignature \relative c' { <b d f>1 } }$

The chord can be represented by the integer notation {0, 3, 6}.

In the common practice period, the diminished triad is considered dissonant because of the diminished fifth (or tritone).

^ Shirlaw, Matthew (2012). The Theory of Harmony, p. 304. Forgotten Books. ISBN 978-1-4510-1534-8.
^ Partch, Harry (1979). Genesis of a Music, pp. 68–69. ISBN 978-0-306-80106-8.
^ Benward; Saker (2003). Music: In Theory and Practice, Vol. I (7th ed.). McGraw-Hill. p. 68. ISBN 978-0-07-294262-0.
^ Benward & Saker (2003), p.77.

[Shirlaw-1] Shirlaw, Matthew (2012). The Theory of Harmony, p. 304. Forgotten Books. ISBN 978-1-4510-1534-8.

[2] Partch, Harry (1979). Genesis of a Music, pp. 68–69. ISBN 978-0-306-80106-8.

[3] Benward; Saker (2003). Music: In Theory and Practice, Vol. I (7th ed.). McGraw-Hill. p. 68. ISBN 978-0-07-294262-0.

[4] Benward & Saker (2003), p.77.

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