Definitions for "Blue Note"
Keywords:  jazz, seventh, pitch, slight, fifth
the slight lowering downward, usually of the third or seventh notes, of a major scale. Some blues musicians, especially singers, guitarists and harmonica players, bend notes upward to reach the blue note.
Flattened inflection of scale degrees 3 and/or 7 in a major key, common to the tonal practice of the blues .
In blues singing or jazz, the deliberate offpitch lowering of certain pitches.