2

I am going through a huge theoretical "reboot" with Laitz's Complete Musician on my own, and I'm having trouble counting the intervals here:

enter image description here

This is in treble clef. The first highlighted interval in the lower part (d5/A4) makes sense; the second (A2/d7) I don't get it. Where did that seventh come from? isn't it just a second between A and B? What am I missing?

8

Ab to B natural is an Augmented second (A2), but if you inverse that interval, i.e. B natural to Ab it is a 7th diminished (d7).

You can also see that in the first example where you have D to Ab (d5/A4). Where the interval between D and Ab is a diminished fifth (d5) and the inverted interval is Ab to D which is an augmented fourth (A4).

4
  1. Note there is Ab in the key signature at the beginning of the measure. This means any A is Ab, lowered by half-tone.
  2. It's difficult to guess without context, but it seems the notation refers to regular and inverted intervals. So (assuming it's in treble clef)
    • D4-Ab4 is diminished 5th
    • Ab4-D5 is augmented 4th
    • Ab4-B4 is augmented 2nd
    • B4-Ab5 is diminished 7th

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.