Lydian #6

One note away from Lydian

Lydian is already the bright mode: its raised fourth is what keeps the scale from settling into the tonic. Raising the sixth as well gives two sharps where Lydian had one, and from C that means A♯ in place of A while the other six notes stay exactly where they were.

Because the change is a single degree, the fastest route to the sound is a Lydian shape with one finger moved. Guitarists who already know the Lydian box need no new fingering, only a new destination for the sixth.

An augmented second in an unlikely place

Raising the sixth opens a three-semitone gap between the fifth and sixth degrees — G to A♯ when the root is C. An augmented second inside a major-sounding scale is unusual, and it carries the whole character of the mode: the bottom half stays firmly major while the top behaves like harmonic minor.

All seven modes of the Neapolitan minor inherit exactly one augmented second, and each puts it somewhere different. Landing high in the scale, as it does here, means the strangeness only shows once a melody climbs past the fifth.

The chord it belongs to

Stacking thirds from the root gives C E G B, a major seventh chord, and the raised fourth sits above it as a ♯11. Cmaj7♯11 is therefore the natural home of the mode — the same chord Lydian serves.

What the raised sixth adds is a note one half step under the major seventh. Voiced with space it reads as colour; voiced close it fights the seventh, and that friction is the practical reason players reach for the mode sparingly.

Where it comes from

Rotating the Neapolitan minor scale onto its second degree produces this mode. B Neapolitan minor is B C D E F♯ G A♯; starting those same seven notes on C gives C D E F♯ G A♯ B, and what was the parent's flat second becomes the new root.

Knowing the parent matters more than knowing the mode. Composers reach for the Neapolitan minor because of the major chord on its flattened second, and the second mode is simply what a melody does when that chord becomes the momentary centre.

What it is confused with

Lydian augmented raises the fifth and leaves the sixth alone: C D E F♯ G♯ A B. Lydian #6 keeps a perfect fifth and moves the sixth instead. Both are bright Lydian variants, and the difference is only which degree above the fourth went up.

Lydian dominant is the closer trap. C D E F♯ G A B♭ contains the same piano key as A♯, but there the note is the flat seventh of a dominant chord, while here the seventh is major and the altered degree is the sixth. Same pitch, opposite harmonic job.

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