D Blues on Guitarrón

D Blues runs 6 notes to the octave. Below it is mapped onto this instrument's A–D–G–C–E–A fingerboard with every D marked, because what a player needs mid-number is not the pattern but where the root is when the harmony moves under it.

The minor pentatonic with a b5 "blue note" wedged in — that one extra note adds grit, tension, and a sly, vocal quality. Tough, expressive, and unmistakably bluesy.

Heard in: Blues, rock, jazz, rhythm and blues, and boogie-woogie — Delta and Chicago blues, Hendrix, Clapton, Stevie Ray Vaughan.

The bass takes almost no melodic line, and that is precisely why these matter: the notes between one root and the next come out of a scale, and an approach that lands wrong is the loudest wrong note in the ensemble.

Take it slowly against the playback until the geometry stops being geometry, then put it under a number in D minor and let the written line pick its own notes out of it.