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