In
jazz and
blues, 'blue notes' are
notes sung or played at a lower
pitch than those of the
major scale for expressive purposes. Typically the alteration is a
semitone or less, but this varies among performers.
Country blues, in particular, features wide variations from the tonic but still with the blue-note feeling.
The blue notes correspond approximately to the
flattened third,
flattened fifth, and
flattened seventh scale degrees, although they approximate just intonation pitches found in
African work songs; specifically, the flatted seventh may often be a
justly tuned minor seventh. These blue notes are what turns a major scale into the
blues scale. The same transformation of notes transforms the
minor scale into the minor blues scale, as heard in songs such as "
Why Don't You Do Right?".
The blues scale is used in almost all
twelve-bar and
eight-bar blues, but it is also used in
blues ballads and in conventional
popular songs with a "blue" feeling, such as
Harold Arlen's "
Stormy Weather".
In its earliest manifestations, the flattened third, or
mediant, and flattened seventh, or
subtonic, were the main blue notes. Emphasis on the flattened fifth, or
dominant, was an innovation in
bebop in the
1940s.
Blue notes are also heard in
English folk music (Lloyd 1967, p.52-4), but are not usually in the usual blues progression.
See also
★
Blue Note Records
★
Blues scale
★
Bend (guitar)
Source
★ Middleton, Richard (1990/2002). ''Studying Popular Music''. Philadelphia: Open University Press. ISBN 0-335-15275-9.
★
★ Lloyd (1967).