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Augmented second
| Inverse | diminished seventh |
|---|---|
| Name | |
| Other names | - |
| Abbreviation | A2[1] |
| Size | |
| Semitones | 3 |
| Interval class | 3 |
| Just interval | 75:64,[2] 125:108, 15:13, 19:16, 19683:16384 |
| Cents | |
| 12-Tone equal temperament | 300 |
| Just intonation | 275, 253, 247.7, 298, 318 |
In classical music from Western culture, an augmented second is an interval that, in 12-tone equal temperament, is sonically equivalent to a minor third, spanning three semitones, and is created by widening a major second by a chromatic semitone.[1][3] For instance, the interval from C to D is a major second, two semitones wide, and the interval from C to D♯ is an augmented second, spanning three semitones.
- ^ a b Benward & Saker (2003). Music: In Theory and Practice, Vol. I, p.54. ISBN 978-0-07-294262-0. Specific example of an A2 not given but general example of major intervals described.
- ^ Haluska, Jan (2003). The Mathematical Theory of Tone Systems, p.xxvi. ISBN 0-8247-4714-3. Classic augmented second.
- ^ Hoffmann, F.A. (1881). Music: Its Theory & Practice, p.89-90. Thurgate & Sons. Digitized Aug 16, 2007. Archaically: redundant or extreme sharp second.
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