F# Lydian

The F# Lydian mode (also written Gb) — F# G# A# B# C# D# E# — shown across the guitar neck.

Also written Gb Lydian. Gb and F# are the same pitch — F# is the spelling in common use.

Swipe the neck sideways to see the higher frets.

F# Lydian is the major scale with one note changed — the #4, B#. That single note is what the mode sounds like; lean on it and the colour is obvious, avoid it and you are just playing major.

The tool shows this from its parent key, Db major, with Gb — the same pitch as F# — marked as where Lydian begins, the same seven notes centered on Db.