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Encyclopedia of Microtonal Music Theory

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augmented-2nd / aug2 / #2

[Joe Monzo]

An interval which is one chromatic semitone higher than the major-2nd of the diatonic scale. For example, in the key of A-minor:

                                         major-2nd
                                         |        |
                                            M2
                                             t
A        B        C        D        E    F        G        =  A-natural-minor diatonic scale

                                           chromatic semitone
                                                   +1
                                                  (t-s)
                                                   / \
                                                  G   G#

A        B        C        D        E    F            G#   =  A-harmonic-minor diatonic scale
                                             t + (t-s)
                                            M2 +  +1
                                         |             |
                                          augmented-2nd
			

The augmented-2nd arose primarily out of "common-practice" harmony as part of the harmonic-minor scale, where the 7th degree ("leading-tone") is raised a half-step so as to approach more closely to the tonic, the note to which it normally resolves.

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