The chords in the key
Each note of the scale builds a chord. The four-note versions add the seventh.
| Degree | Chord | Notes | Role | With seventh |
|---|---|---|---|---|
| I | F♯ | F♯ – A♯ – C♯ | Tonic: home | F♯maj7 |
| ii | G♯m | G♯ – B – D♯ | Subdominant | G♯m7 |
| iii | A♯m | A♯ – C♯ – E♯ | Tonic substitute | A♯m7 |
| IV | B | B – D♯ – F♯ | Subdominant | Bmaj7 |
| V | C♯ | C♯ – E♯ – G♯ | Dominant: tension | C♯7 |
| vi | D♯m | D♯ – F♯ – A♯ | Relative tonic | D♯m7 |
| vii° | E♯dim | E♯ – G♯ – B | Dominant (leading tone) | — |