Dorian

The notes

G A B♭ C D E F, then G. It is the second mode of F major and shares that key’s single flat. Playing F major from G gives the scale directly.

Against G natural minor, which has E♭, the difference is one semitone in one place. That is all a mode ever is, and it is enough to change the character completely.

On the fretboard

The third-fret position with the root on the low E is standard, and it shares most of its notes with the G minor pentatonic that players already know. Adding the A and the E natural converts the box.

The E is the note to sound. A solo that avoids it is playing natural minor regardless of what the chart says, and listeners hear the difference even if they cannot name it.

Where it is used

Modal jazz over a static Gm7, and funk vamps built on the same chord. It also appears in film scoring where minor is wanted without heaviness.

In rock the mode shows up whenever a riff in G minor includes an E natural — usually via a C major chord, which contains it and is the giveaway.

For a guitarist the practical value is that G minor becomes playable without the key feeling heavy: the same barre shapes serve, but the E natural opens the harmony enough that a long vamp does not tire the ear. That is the difference between a riff that repeats and one that drags.