A Blues on Guitar

A Blues runs 6 notes to the octave. Below it is mapped onto this instrument's E–A–D–G–B–E fretboard with every A 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.

Scale work in the armonía is for the passing figure that joins one chord to the next — a few notes at the seam of a change, played by one member while the other keeps the pattern intact.

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