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Both in the Internet and in textbooks one can find different versions of blues scales, which easily confuses newcomers .Which of them are correct? Indeed, here are involved several different scales, related to each other:
Minor pentatonic - Bb, G, F, Eb, C.
Major pentatonic - A, G, E, D, C. Full blues scale - C, B, Bb, G, Gb, F, E, Eb, C; where both thirds and both seveths are called blues notes, and resemble the Arabic maqam, where quarter tone pitches are located in the same places. Flatted fifth also refers to the blues notes.
Major blues scale - C, D, Eb, E, G, A ; its minor transformation - C, D, Eb, G, A .
The blues scales are the result of mixing African pentatonic and European major-minor on American soil, which approved the status of blues as the first purely American genre. From the African pentatonic, into the blues scale came tradition of building from top to bottom ; and what we see in books is just sloppy , because the main direction of classical blues tunes is also descending.
johan, listen to the music is more correctly instead of looking in the book:
For example : 07:31 - Charly McCoy - Motherless Blues
From the first words the singer swings with by glissando between the fifth and flatted fifth, then descends through both thirds to the prima. In the 9th bar , he slips through both sevenths, also by gliss. It was more correct to write this way:
I'm not sure what your scale is Johan, probably a simplified version. The most significant point about the full scale as described by Nahum is that it has the major and minor 3rd, which when you slide from the Eb to the E gives you the bluesy effect. As Nahum indicates in his reply the reality is that the blue notes are in the cracks on the Piano, and so the nearest we Pianists can get to a quarter note (half way between Eb and E) is to play them very close together.
Simon Yamaha CLP535 Primarily working on: No Mystery (Corea) Elite Syncopations (Joplin)