E Phrygian

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

Swipe the neck sideways to see the higher frets.

E Phrygian is the natural minor with one note changed — the b2, 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 minor.

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