Progressions in Bb — Puerto Rican Cuatro (Antiguo A-D-G-C-F)

Bb major harmonises to Bb – Cm – Dm – Eb – F – Gm – A°; Bb minor to Bbm – C° – Db – Ebm – Fm – Gb – Ab. Each chord links to its Puerto Rican Cuatro (Antiguo A-D-G-C-F) grips, so a whole key becomes a short list of hand positions.

Most of this repertoire lives on three or four of these chords, and the interesting work is in what happens between them: the pick states a line, the grip lands underneath it, and the next change arrives before the ear has finished the last one.