D Dorian — Puerto Rican Cuatro (Antiguo A-D-G-C-F)

D Dorian is 7 notes to the octave (modes family), drawn here across the Puerto Rican Cuatro (Antiguo A-D-G-C-F)'s A-D-G-C-F strings with every D marked, so home stays visible from anywhere in the pattern.

Minor with a raised 6th (natural 6) — soulful, smooth, and less dark than natural minor. The quintessential jazz-minor and blues mode.

Heard in: "So What" (Miles Davis), "Oye Como Va" (Santana), "Eleanor Rigby" (Beatles) — rock, blues, funk, jazz.

Five courses spanning a minor thirteenth give a scale room to breathe: three or four notes to a course in first position, and a top string clear enough that a melody can live there while the rest of the grip stays down. These maps light every root so a run knows where home is before it leaves.

Work it in one position before you work it up the neck. The doubled courses forgive nothing: a fret held half a millimetre short buzzes on one string of the pair and rings on the other, and that difference is audible long before the run is fast.