Tritone Substitutions
As long as the root motion is preserved, you can use
virtually any quality
of chord for your composition.
Beginning with the common progression
| G Em |
Am D |
we can substitute major chords for the minors
| G E | A
D |
or dominant chords
| G E7 |
A7 D7 |
Diminished chords are often found for the second chord
| Gmaj7 Edim7
| Am7 D9 |
All of the above not only work, but are extremely common.
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