The name “pentablues” came about because this scale is the pentatonic scale plus one note. The term “ blue note” is usually translated as “ outside note“, due to the fact that this note does not belong to the natural scale. It finds its roots in African-American music at the time of slavery and ended up being widely used within blues, receiving the name “blues scale”. The blues scale is one of the first scales taught to improvisation students, and it usually ends up being the only scale they use besides the major and the pentatonic scale. Great, but now the basic questions arise: where did this scale come from? And what is it for? Now check the C major blues scale and notice how the note added is the same (Eb): C major blues scale Check the shape of the A minor blues scale (with the blue note highlighted in red) below: A minor blues scale Notice that the note that was added is the same on both scales, just memorize the minor blues scale and transmit that note to the other shapes when making a solo. This note became known as the “ blue note“, and is the flat fifth in the case of the minor pentatonic, or the flat third in the case of the major pentatonic. The blues scale (or Pentablues) is the pentatonic scale plus one note.
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