Scale degrees · F♯ major
The ♭13 of F♯ is D
The ♭13 (flat thirteen, written b13) of F♯ (F sharp, F#) is D: a minor thirteenth above the root.
F♯ — the root, 1D — the ♭13
How to find it
A 13th is a 6th an octave up, so it takes the 6th's letter: F, G, A, B, C, D.
Then the sound: a minor thirteenth is 20 semitones above F♯, which is exactly where D is — no sharp or flat needed.
Where you meet it
The ♭13 is an altered tension of the dominant chord, one of the notes of the altered scale.
In F♯7♭13:
F♯ · A♯ · C♯ · E · D
The ♭13 in every key
| Key | The ♭13 |
|---|---|
| C | A♭ |
| G | E♭ |
| D | B♭ |
| A | F |
| E | C |
| B | G |
| F♯ | D |
| D♭ | B𝄫 |
| A♭ | F♭ |
| E♭ | C♭ |
| B♭ | G♭ |
| F | D♭ |
Every degree of F♯
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