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Encyclopedia of Microtonal Music Theory

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augmented-11th / aug11 / sharp-11 / #11 / +11

[Joe Monzo]

A diatonic interval which traverses 10 steps in a diatonic scale, and covers a pitch distance bounded by 11 nominals inclusively, an octave plus an augmented-4th.

The augmented-11th became a common feature of blues and jazz harmony, especially during the bebop period in the late 1940s, particularly as an "extension" on top of a dominant-7th chord.

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