I just saw this comment by Tim, in another question:

can't have a C. It's spelt D, F, Ab, Cb.Or as a triad, just the 1st 3 notes. Ao/F is F b9, and Ao/F# will just be F#o. Or D b9/F#. If this helps - hope so.

What exactly are , A°/F, A°/F# and F#°? This is the first time I have seen something like this.

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    I assumed that was just a diminished sign in an easier to type form. Technically it should be a superscript degree sign, but that's not easy to input in Stack Exchange. – Pat Muchmore Jan 27 '15 at 15:29
  • I've edited your Do by , that means isn't Do. = D dim and `D°7 = D dim 7. Also Ao and F#o are written wrong. – Albrecht Hügli Jun 4 at 12:35

The 'o' bit designates dim, or diminished. Slightly different from the ø which is half-diminished.(Which was pointed out by someone as wrong - it should be a third diminished!) Wish my keyboard could print it properly - it probably can, but I'm not clever enough to make it work! Half-dim.,(that could even be me...) incidentally is aka m7b5.

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  • I'd just like to point out that perhaps the oldest known half diminished seventh chord, in this case b d f a, comes in the English medieval canon Sumer is icomen in. – Scott Wallace May 30 '17 at 15:10
  • @ScottWallace - I'm betting it's actually V9 without the root. Can't say I know it. Must listen... – Tim May 30 '17 at 15:15
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    @Tim- yes, do listen to it. But the way the piece is constructed, basically alternate I and ii chords in Ionian, makes the V9 a modern interpolation. – Scott Wallace May 30 '17 at 15:19
  • @ScottWallace - can't find the run mentioned in any of the dots I've trawled through. – Tim May 30 '17 at 15:27
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    @Tim- I guess everything is off subject, if you just look at it hard enough. Yes, with modern ears, it sounds like a g-b-d-f-a ninth chord, minus the root. But the g never happens in the whole piece as root of a chord: this is a good example of an ionian piece that is decidedly not major. – Scott Wallace May 30 '17 at 16:20

`What does the '°' notation signify?

° means diminished, which means that you play a minor chord with a flattened five.

`What does the 'X/Y' notation signify?

This is called slash chords. This means that you play an inversion of the X chord where the lowest note is Y. Example: C/G is played as G, C, E.

In some cases, like the ones that you present, an extra note might be added that is not necessarily a part of the original chord. Example: C/Bb is played as Bb, C, E, G, which is just an inversion of C7 with the seventh note in the bass.

What is ?

D, F, Ab

What is A°/F?

F, A, C, Eb

What is A°/F#?

F#, A, C, Eb

What is F#°?

F#, A, C

I found this site to useful: https://www.pianochord.org/

To find out what means, then you

  • select D in the top bar
  • check through the D chord categories; since it's not there, you
  • go down to the Explanations below
  • find Ddim - D diminished (D°)
  • select Ddim in the listing above

This gives https://www.pianochord.org/d-dim.html

D diminished

On the website, you also get help to fingering.

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  • I wonder why in this collection of chords there is no D dim7? D°7? – Albrecht Hügli Jan 24 '19 at 11:59
  • I don't know whether it has been added in the meantime. But it's there now. – Little Helper Jun 4 at 10:25
  • "which means that you play a minor chord with a flattened five" While that's true, to me,a dim is different from a m7b5. Both are a minor chord with a flat 5, but the 7th of the former is 1/2 step lower than the latter. – Duston Jun 4 at 13:12
  • @Duston, I completely agree that dim and m7b5 are different, but notice that I'm talking about dim and not dim7. I also agree with you that dim7 and m7b5 are different by the 7th being shifted a semitone. – Little Helper Jun 4 at 13:51

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