Editing Blues scale (section)

===Nonatonic===
An essentially nine-note blues scale is defined by Benward and Saker as a [[chromatic scale|chromatic]] variation of the major scale featuring a flat third and seventh degrees (in effect substitutions from [[Dorian mode]]) which, "alternating with the normal third and seventh scale degrees are used to create the blues inflection. These 'blue notes' represent the influence of African scales on this music."<ref>Benward & Saker (2003). ''Music: In Theory and Practice'', Vol. I, p. 39. Seventh Edition. {{ISBN|978-0-07-294262-0}}.</ref>
: <score sound="1"> {
\override Score.TimeSignature #'stencil = ##f
\relative c' { 
  \clef treble \time 9/4
  c4 d es( e) f g a bes( b) c2
} }
</score>
A different and non-formal way of playing the scale is by the use of [[quarter tone]]s, added to the 3rd and 7th degrees of the minor blues scale. For example, the A minor blues scale with quarter tones is A–B–C{{music|t}}–D–E–F–G{{music|t}}, where {{music|t}} is a [[half sharp]]. Also, the note D{{music|#}} can be used as an additional note. Guitar players can raise a given note by a quarter tone through bending.