Basic substitution question

[ragman1]

Dim arpeggios sound great over 7b9 chords.

Oh, obviously - all chord tones!

[GuyBoden]

Oh, obviously - all chord tones!

Obviously, yes, it's a very "Old School" way of playing over a 7b9 chord, which was taught to me many years ago by older players, but it still sounds good to my ears, especially from the 3rd note.
Example: B D F G#(Ab) over G7b9.

[ragman1]

You're losing it, Guy, you just posted that image a few posts ago. No better way to spell out a dim chord or make a dom chord sound like a b9. Resolves easily too.

[GuyBoden]

You're losing it, Guy, you just posted that image a few posts ago. No better way to spell out a dim chord or make a dom chord sound like a b9. Resolves easily too.

I know, but the image shows good examples of using dim arps.

Also, I very often use the diminished arpeggio over the ii chord in a Major ii-V-I.

Sounds good too. All very easy beginners stuff.

Example below:

[StevenA]

You can’t sub a V7 for Ima7 or iiim7 in this case directly, but you can sub in the same spaces occupied by those chords. For example, in Misty, the first melody note ( in Eb) is D and the first chord is Ebmaj7. You could sub Bb7 (the V7 of Eb) quite easily as the D melody note is the 3rd of Bb, and can land on Ebmaj7 2 beats later. I’m not sure it’s a good idea to subscribe to theoretical inflexibility.