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Bebop scale
The bebop scales are frequently used in jazz improvisation and are derived from the modes of the major scale, the melodic minor scale, and the harmonic minor scale.
There are four types of frequently used bebop scales: the bebop dominant scale, the bebop Dorian scale, the bebop major scale, and the bebop melodic minor scale. Each of these scales has an extra chromatic passing tone. In general, bebop scales consist of traditional scales with an added passing tone placed such that when the scale is begun on a chord tone and on the downbeat, all other chord tones will also fall on downbeats, with the remaining tones in the scale occurring on the upbeat (given that the scale is played ascending or descending; i.e., no intervallic skips are played). As such, many heptatonic scales may be modified by the addition of an eighth passing tone to accomplish this same effect; however, the modifier "bebop" is reserved to indicate those scales most frequently used—and popularized—during the bebop era (and/or by modern practitioners of the bebop genre).
== Bebop dominant scale ==
The bebop dominant scale is derived from the Mixolydian mode and has a chromatic passing tone between the 7th and the root. It has all the notes in both the major scale and the Mixolydian scale of the same root. This scale is often used over dominant 7th chords and all extended dominant chords,〔Miller, Michael (2004). ''Complete Idiot's Guide to Solos and Improvisation'', p.96. ISBN 1-59257-210-3.〕 and the ii V chord progressions. "When someone says they're playing 'the bebop scale,' this is the one they're talking about."〔
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