Puerto Rican Cuatro (Antiguo A-D-G-C-F) Fretboard Explorer

An interactive note map of the Puerto Rican Cuatro (Antiguo A-D-G-C-F)'s neck: tap a note to light it on every string and fret, and read the lattice for what it is — an A-D-G-C-F neck whose open strings spell F major pentatonic.

Light the open strings first — together they spell F major pentatonic, and that major pentatonic scale is the reason so much of the repertoire sits in the keys it sits in.

Every adjacent pair on A-D-G-C-F climbs, so the open strings run straight from bottom to top across a minor thirteenth.