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


1 Answer 1


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, 2018 at 9:44
  • 2
    @fferri: On this site I've found ++2 but I don't know how common and universally accepted it is.
    – Matt L.
    Apr 17, 2018 at 10:11
  • 3
    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, 2018 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, 2018 at 13:21
  • 4
    “Of course, this interval is sonically equivalent to a major third.” This is only true in equal temperament.
    – 11684
    Apr 17, 2018 at 13:39

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