Mode
G Lydian
The G Lydian mode — G A B C# D E F# — shown across the guitar neck.
Swipe the neck sideways to see the higher frets.
G Lydian is the major scale with one note changed — the #4, C#. 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
G A B C# D E F#
Intervals
1 2 3 #4 5 6 7
Parent scale
D Major
Degree of parent
4
The tool shows this from its parent key, D major, with G marked as where Lydian begins, the same seven notes centered on D.