Hi,
I was reading on adding substitute chords to the static V7 chords.
Let's learn some simple Jazz together.
Say we have a progression like this: Eb |Eb |D7 |D7 |Eb |Eb |C7 |C7 |
We can use the ii V substitute to make it more interesting.
It will become like this: Eb |Eb |Am7 |D7 |Eb | Eb |Gm7| C7|
The reverse is true. So if you have a progression like Am7 D7, it can become D7 D7.
Have fun!