Lydian b3

Minor third, major seventh, raised fourth

Three features define the scale and each pulls in a different direction. The minor third makes it a minor scale, the major seventh gives it a leading tone, and the raised fourth is a tritone above the root. Together they outline a minor-major seventh chord with a sharp eleventh: C E♭ G B, plus F♯.

That chord is uncommon and so is the scale, but the sound is recognisable. It is the harmony of film cues that need to be tense without being dissonant, and of jazz writing that wants a minor tonic that will not settle.

One note from Dorian #4

Dorian #4, the fourth mode of harmonic minor, is 1 2 b3 #4 5 6 b7. Set against Lydian b3 the two scales share six notes and differ in the seventh alone — minor there, major here. That single note decides everything about how each is used.

Dorian #4 sits over a minor seventh chord and belongs to the blues-inflected corner of the catalogue. Lydian b3 sits over a minor-major seventh and belongs to the tonic. Playing one where the other is wanted is audible immediately, and it is the most common mistake with this scale.

The augmented second and the tritone

The augmented second inherited from harmonic major falls between the minor third and the raised fourth: E♭ up to F♯ is three semitones, a wide step in the middle of the scale. It is the widest gap and the easiest landmark when learning the fingering.

The tritone between the root and F♯ is the other structural interval. Held against a C minor chord it gives the sharp eleventh; used as a passing note it simply brightens the scale. Which of the two it sounds like depends entirely on the bass, and that is worth experimenting with before writing it into a line.

Where it fits in the family

Harmonic major is the major scale with a flattened sixth, and its seven modes are the entries in this part of the catalogue. Lydian b3 is the fourth of them, and among the seven it is the one most likely to be used deliberately rather than encountered by accident.

The others in the family — Dorian b5, Phrygian b4, Mixolydian b2, Lydian augmented ♯2 and Locrian bb7 — each sit over one chord type, and the same is true here. These are chord-scales, not keys, and the parent scale is what holds them together.

Frequently asked questions