Bebop scale
From The Art and Popular Culture Encyclopedia
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Bebop scale is a term referring to the practice of adding a note (typically a chromatic passing tone) to any common seven tone scale in order to make it an eight tone scale. An eight tone scale is balanced, meaning that it contains an even number of notes (8), and an even number of notes enables the primary chord tones to continuously fall on the strong beats of "1 2 3 4" (downbeats). This is unlike common seven note scale (an odd quantity of notes) in which the chord tones do not all naturally fall on the beats "1 2 3 4" (downbeats). These bebop scales are frequently used in jazz improvisation. Jazz educator David Baker nicknamed these scales the 'bebop scales' because they were used often by jazz artists from the Bebop Era. These artists include Charlie Christian, Charlie Parker, Bud Powell, and Dizzy Gillespie, to name a few.