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I am familiar with basic music theory and know there are 7 notes in the major and minor scales. However, sometimes in Jazz or with the Harmonic minor scale, you might add an extra note here or there. What I'm wondering is if there are any standards when it comes to 8-note scales (8-note major/minor scales specifically), or if not, what you consider to be the best added note to the standard 7-note major/minor pair. By pair I mean that the C major scale is also the D-minor scale, so this 8th note would work well with both cases.

closed as primarily opinion-based by Richard, ttw, user45266, Doktor Mayhem Feb 24 at 15:51

Many good questions generate some degree of opinion based on expert experience, but answers to this question will tend to be almost entirely based on opinions, rather than facts, references, or specific expertise. If this question can be reworded to fit the rules in the help center, please edit the question.

  • A good example of Tim's answer is the melody of Moanin' by Bobby Timmons. – Your Uncle Bob Feb 17 at 18:24
  • I don't know what you mean by "By pair I mean that the C major scale is also the D-minor scale". The only scale with a tonic of D that shares all its notes with the C major scale and contains no notes that are not in C major is the D Dorian scale. – Dekkadeci Feb 18 at 7:48
  • "Or if not, what you consider to be the best added note to the standard 7-note major/minor pair" should be removed. – user45266 Feb 20 at 0:53
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It's going to be a chromatic note, and the one extra that best fits both major and minor scale notes could be ♭5/♯4. It's used a lot in blues and jazz - in blues it's known as ♭5, whereas in jazz it tends to be called ♯4. Love to know why, as it's the same note pitch. Possibly because in blues, the 3, 5 and 7 all get flattened from the normal major notes, so sticking with flats.

It's the tritone from the root - in key C, it's F♯/G♭, and lies just between the other two prominent notes in that key - F and G.

  • I suspect that the blues uses b5-to-4 more often than jazz does, and jazz uses #4-to-5 more often than the blues does. – Dekkadeci Feb 18 at 7:49

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