G Mixolydian

The G Mixolydian mode — G A B C D E F — shown across the guitar neck.

Swipe the neck sideways to see the higher frets.

G Mixolydian is the major scale with one note changed — the b7, 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.

The tool shows this from its parent key, C major, with G marked as where Mixolydian begins, the same seven notes centered on C.