D Mixolydian — Cuban Tres

D Mixolydian is 7 notes to the octave (modes family), drawn here across the Cuban Tres's GCE courses with every D marked, so home stays visible from anywhere in the pattern.

Major with a flatted 7th (b7) — bright and bluesy. The dominant chord turned into a tonal center with a rock/folk edge.

Heard in: "Sweet Home Chicago", "Norwegian Wood" (Beatles), Celtic and folk music — anywhere a major sound needs a darker, looser edge.

Three courses tuned GCE put a scale in a narrow, honest place: two or three notes to a course, no spare strings to hide on, and the G course sounding above the C beside it — so a run that looks like it descends on paper can rise under the fingers. These maps mark every root so the figure never loses home.

Practise it as a figure, not a ladder: pick four of its notes, loop them as a two-bar phrase against a slow pulse, then slide the same phrase to the next position. That is how this instrument actually uses a scale — as raw material for a repeating line.