Scale degrees · F♯ major
The 13 of F♯ is D♯
The 13 (thirteen) of F♯ (F sharp, F#) is D♯ (D sharp): a major 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 major thirteenth is 21 semitones above F♯, and the D that is 21 semitones up is D♯.
That is why it is D♯ and not E♭: E♭ is the same key on the piano, but from F♯ it would be a 14th, not a 13th.
Where you meet it
The 13 is the 6 an octave up: the top of a thirteenth chord, and of the classic dominant voicing with the 3 and the ♭7.
In F♯13:
F♯ · A♯ · C♯ · E · G♯ · 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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