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(In chord symbols, the symbol A, used for augmented intervals, is typically replaced by + or ♯) In this case, the chord is viewed as a C major seventh chord (CM 7 ) in which the third note is an augmented fifth from root (G ♯ ), rather than a perfect fifth from root (G).
Augmented and diminished intervals on C: d2 ⓘ, A2 ⓘ, d3 ⓘ, A3 ⓘ, d4 ⓘ, A4 ⓘ, d5 ⓘ, A5 ⓘ, d6 ⓘ, A6 ⓘ, d7 ⓘ, A7 ⓘ, d8 ⓘ, A8 ⓘ Augmented intervals are wider by one semitone than perfect or major intervals, while having the same interval number (i.e., encompassing the same number of staff positions): they are wider by a ...
A diminished interval is an interval obtained from a minor interval or perfect interval by narrowing it by a chromatic semitone, meaning that the interval is narrowed by a semitone, but the staff positions are not changed (only an accidental is changed); the process may occasionally be referred to as diminution For example, a diminished sixth ...
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 "o 7" symbols. For example, the diminished triad built on B, written as B o, has pitches B-D-F:
The diminished triad also contains a tritone in its construction, deriving its name from the diminished-fifth interval (i.e. a tritone). The half-diminished seventh chord contains the same tritone, while the fully diminished seventh chord is made up of two superposed tritones a minor third apart.
A major interval is one semitone larger than a minor interval. The words perfect, diminished, and augmented are also used to describe the quality of an interval.Only the intervals of a second, third, sixth, and seventh (and the compound intervals based on them) may be major or minor (or, rarely, diminished or augmented).
The augmented chord on I may contain the major seventh (I 7 5 (Play ⓘ) or I 6 5 (Play ⓘ)), while the augmented chord on V may contain the minor seventh (V 7 5 (Play ⓘ), V 6 5 (Play ⓘ), or V 4 3 (Play ⓘ)). [1] In C: C–E–G ♯ –B and G–B–D ♯ –F. The augmented triad on the V may be used as a substitute dominant, and may ...
In some fake books and lead sheets, all triads may be represented by upper case numerals, followed by a symbol to indicate if it is not a major chord (e.g. "m" for minor or "ø" for half-diminished or "7" for a seventh chord). An upper case numeral that is not followed by a symbol is understood as a major chord.