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

Twelve roots, 24 types — pick one and its map lights up A-D-G-C-F.

The Puerto Rican Cuatro (Antiguo A-D-G-C-F) scale reference: choose a root and one of 24 types, and the notes arrive mapped across A-D-G-C-F with every root marked.

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.