Tritone substitution is used for harmonic diversity
& contrast, often using altered chords.
& contrast, often using altered chords.
Tritone Chord Substitution
Shown in  ii - V - I - VI  Turnaround
Key ii    (tritone) V    (tritone)   I   VI    (tritone)  
C Dm7    (Ab7) G7    (Db7) C A7alt    (Eb7alt )  
Db Ebm7   (A7) Ab7   (D7) Db Bb7alt   (E7alt )  
D Em7    (Bb7) A7    (Eb7) D B7alt    (F7alt )  
Eb Fm7    (B7) Bb7   (E7) Eb C7alt    (Gb7alt )  
E F#m7   (C7) B7    (F7) E C#7alt   (G7alt )  
F Gm7    (Db7) C7    (Gb7) F D7alt    (Ab7alt )  
Gb Abm7   (D7) Db7   (G7) Gb Eb7alt   (A7alt )  
G Am7    (Eb7) D7    (Ab7) G E7alt    (Bb7alt )  
Ab Bbm7   (E7) Eb7   (A7) Ab F7alt    (B7alt )  
A Bm7    (F7) E7    (Bb7) A F#7alt   (C7alt )  
Bb Cm7    (Gb7) F7    (B7) Bb G7alt    (Db7alt )  
B C#m7   (G7) F#7  (C7) B G#7alt   (D7alt )  
| Key | ii (tritone) | V (tritone) | I | VI (tritone) | 
|---|---|---|---|---|
| C | Dm7 (Ab7) | G7 (Db7) | C | A7alt (Eb7alt ) | 
| Db | Ebm7 (A7) | Ab7 (D7) | Db | Bb7alt (E7alt ) | 
| D | Em7 (Bb7) | A7 (Eb7) | D | B7alt (F7alt ) | 
| Eb | Fm7 (B7) | Bb7 (E7) | Eb | C7alt (Gb7alt ) | 
| E | F#m7 (C7) | B7 (F7) | E | C#7alt (G7alt ) | 
| F | Gm7 (Db7) | C7 (Gb7) | F | D7alt (Ab7alt ) | 
| Gb | Abm7 (D7) | Db7 (G7) | Gb | Eb7alt (A7alt ) | 
| G | Am7 (Eb7) | D7 (Ab7) | G | E7alt (Bb7alt ) | 
| Ab | Bbm7 (E7) | Eb7 (A7) | Ab | F7alt (B7alt ) | 
| A | Bm7 (F7) | E7 (Bb7) | A | F#7alt (C7alt ) | 
| Bb | Cm7 (Gb7) | F7 (B7) | Bb | G7alt (Db7alt ) | 
| B | C#m7 (G7) | F#7 (C7) | B | G#7alt (D7alt ) | 


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