Mode
F# Mixolydian
The F# Mixolydian mode (also written Gb) — F# G# A# B C# D# E — shown across the guitar neck.
Also written Gb Mixolydian. Gb and F# are the same pitch — F# is the spelling in common use.
Swipe the neck sideways to see the higher frets.
F# Mixolydian is the major scale with one note changed — the b7, E. 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.
Notes
F# G# A# B C# D# E
Intervals
1 2 3 4 5 6 b7
Parent scale
B Major
Degree of parent
5
The tool shows this from its parent key, B major, with F# marked as where Mixolydian begins, the same seven notes centered on B.