Resumen:
By operating with only five notes, the pentatonic scale establishes a stable and intuitive musical system in which structural clarity allows for variation without the risk of excessive dissonance. From this consolidated structure, which forms the basis of countless musical styles, especially popular music, the blues introduced a decisive inflection by incorporating additional notes into the scale. Without delving into excessive technicalities, these are subtle tonal deviations, small dissonances often associated with a more melancholic sound, known as blue notes. Played fleetingly rather than as emphatic accents, they briefly tension the system, adding expressiveness and depth while keeping the underlying structure intact.
Fuente: www.archdaily.com