You say an interval "is classified" as though there were some immutable truth to the terms you cite, but to my knowledge that is not the case. I don't disagree with the terms used, but if you want the answer you should get it from the person who assigned them to the intervals. In the end consonance and dissonance are quite subjective.
Classification of 9th, 11th, and 13th intervals by consonance and dissonance?
An interval is classified by its consonance or dissonance: as an open consonance (unison, perfect fifth, octave), a soft consonance (major and minor third and sixth), mild dissonance (major second and minor seventh), sharp dissonance (minor second and major seventh), ambiguous (perfect fourth), or restless (tritone).
How are minor, major, and augmented ninth, eleventh, and thirteenth intervals classified with respect to consonance and dissonance?
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2 Answers By Expert Tutors
James R. answered 07/25/19
Tutor
New to Wyzant
Cornell Student Tutor English/STEM/ACT
A ninth is the same as a second, except up an octave from the root note. An 11th is an octave + a P4th. A thirteenth is an octave + maj6th. So you can use the same relationships as the smaller intervals.
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