9

It is a number 2 interval, but being 4 semitones, it is beyond an augmented second. So, what it is?

20

The interval from any G (flat / sharp / neutral) to any A (flat / sharp / neutral) (in the same octave) is always a second. In your case, since the G is flat and the A is sharp, you have a doubly augmented second.

Of course, this interval is sonically equivalent to a major third.

  • is there a symbol for that? AA2 perhaps? – fferri Apr 17 '18 at 9:44
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    @fferri: On this site I've found ++2 but I don't know how common and universally accepted it is. – Matt L. Apr 17 '18 at 10:11
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    Has anyone ever personally seen this used? I have not. I'd be curious to see an example. I cannot think of a theoretical justification for using it, either. I'd be interested in an explanation for that as well. – Heather S. Apr 17 '18 at 11:09
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    @HeatherS. See the question that Tim H posted as a comment to the original post: music.stackexchange.com/questions/15430/… – Richard Apr 17 '18 at 13:21
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    “Of course, this interval is sonically equivalent to a major third.” This is only true in equal temperament. – 11684 Apr 17 '18 at 13:39

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