Ref: Diatonic Keys for Triads
This page shows which major, minor, and harmonic minor keys a particular triad is diatonic to. Find the chord that you want to know which keys it belongs to in the left-most column, then look for the x's on that row for all the keys.
- () - Natural Minor Only
- [] - Harmonic Minor Only
| Key/ Chd |
A | A♯/ B♭ |
B | C | C♯/ D♭ |
D | D♯/ E♭ |
E | F | F♯/ G♭ |
G | G♯/ A♭ |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| A | I | (VII) | VI | [V] | IV | (III) | ||||||
| Am | i | vi | (v) | iv | iii | ii | ||||||
| A+ | [III+] | |||||||||||
| A° | [vii°] | ii° | ||||||||||
| Key/ Chd |
A | A♯/ B♭ |
B | C | C♯/ D♭ |
D | D♯/ E♭ |
E | F | F♯/ G♭ |
G | G♯/ A♭ |
| A♯/B♭ | I | (VII) | VI | [V] | IV | (III) | ||||||
| A♯/B♭m | i | vi | (v) | iv | iii | ii | ||||||
| A♯/B♭+ | [III+] | |||||||||||
| A♯/B♭° | [vii°] | ii° | ||||||||||
| Key/ Chd |
A | A♯/ B♭ |
B | C | C♯/ D♭ |
D | D♯/ E♭ |
E | F | F♯/ G♭ |
G | G♯/ A♭ |
| B | I | (VII) | VI | [V] | IV | (III) | ||||||
| Bm | ii | i | vi | (v) | iv | iii | ||||||
| B+ | [III+] | |||||||||||
| B° | ii° | [vii°] | ||||||||||
| Key/ Chd |
A | A♯/ B♭ |
B | C | C♯/ D♭ |
D | D♯/ E♭ |
E | F | F♯/ G♭ |
G | G♯/ A♭ |
| C | (III) | I | (VII) | VI | [V] | IV | ||||||
| Cm | ii | i | vi | (v) | iv | iii | ||||||
| C+ | [III+] | |||||||||||
| C° | ii° | [vii°] | ||||||||||
| Key/ Chd |
A | A♯/ B♭ |
B | C | C♯/ D♭ |
D | D♯/ E♭ |
E | F | F♯/ G♭ |
G | G♯/ A♭ |
| C♯/D♭ | (III) | I | (VII) | VI | [V] | IV | ||||||
| C♯/D♭m | iii | ii | i | vi | (v) | iv | ||||||
| C♯/D♭+ | [III+] | |||||||||||
| C♯/D♭° | ii° | [vii°] | ||||||||||
| Key/ Chd |
A | A♯/ B♭ |
B | C | C♯/ D♭ |
D | D♯/ E♭ |
E | F | F♯/ G♭ |
G | G♯/ A♭ |
| D | IV | (III) | I | (VII) | VI | [V] | ||||||
| Dm | iv | iii | ii | i | vi | (v) | ||||||
| D+ | [III+] | |||||||||||
| D° | ii° | [vii°] | ||||||||||
| Key/ Chd |
A | A♯/ B♭ |
B | C | C♯/ D♭ |
D | D♯/ E♭ |
E | F | F♯/ G♭ |
G | G♯/ A♭ |
| D♯/E♭ | IV | (III) | I | (VII) | VI | [V] | ||||||
| D♯/E♭m | iv | iii | ii | i | vi | (v) | ||||||
| D♯/E♭+ | [III+] | |||||||||||
| D♯/E♭° | ii° | [vii°] | ||||||||||
| Key/ Chd |
A | A♯/ B♭ |
B | C | C♯/ D♭ |
D | D♯/ E♭ |
E | F | F♯/ G♭ |
G | G♯/ A♭ |
| E | [V] | IV | (III) | I | (VII) | VI | ||||||
| Em | (v) | iv | iii | ii | i | vi | ||||||
| E+ | [III+] | |||||||||||
| E° | ii° | [vii°] | ||||||||||
| Key/ Chd |
A | A♯/ B♭ |
B | C | C♯/ D♭ |
D | D♯/ E♭ |
E | F | F♯/ G♭ |
G | G♯/ A♭ |
| F | VI | [V] | IV | (III) | I | (VII) | ||||||
| Fm | (v) | iv | iii | ii | i | vi | ||||||
| F+ | [III+] | |||||||||||
| F° | ii° | [vii°] | ||||||||||
| Key/ Chd |
A | A♯/ B♭ |
B | C | C♯/ D♭ |
D | D♯/ E♭ |
E | F | F♯/ G♭ |
G | G♯/ A♭ |
| F♯/G♭ | VI | [V] | IV | (III) | I | (VII) | ||||||
| F♯/G♭m | vi | (v) | iv | iii | ii | i | ||||||
| F♯/G♭+ | [III+] | |||||||||||
| F♯/G♭° | ii° | [vii°] | ||||||||||
| Key/ Chd |
A | A♯/ B♭ |
B | C | C♯/ D♭ |
D | D♯/ E♭ |
E | F | F♯/ G♭ |
G | G♯/ A♭ |
| G | (VII) | VI | [V] | IV | (III) | I | ||||||
| Gm | vi | (v) | iv | iii | ii | i | ||||||
| G+ | [III+] | |||||||||||
| G° | ii° | [vii°] | ||||||||||
| Key/ Chd |
A | A♯/ B♭ |
B | C | C♯/ D♭ |
D | D♯/ E♭ |
E | F | F♯/ G♭ |
G | G♯/ A♭ |
| G♯/A♭ | (VII) | VI | [V] | IV | (III) | I | ||||||
| G♯/A♭m | vi | (v) | iv | iii | ii | i | ||||||
| G♯/A♭+ | [III+] | |||||||||||
| G♯/A♭° | [vii°] | ii° |