C Dorian

The C Dorian mode — C D Eb F G A Bb — shown across the guitar neck.

Swipe the neck sideways to see the higher frets.

C Dorian is the natural minor with one note changed — the 6, A. 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, Bb major, with C marked as where Dorian begins, the same seven notes centered on Bb.