Bebop Dorian

The leading tone under a minor chord

The bebop Dorian scale keeps everything about Dorian and adds one note directly below the root. Descending, that gives C B B♭ A G F E♭ D — the line falls through a chromatic pair before settling, which is exactly the gesture the bebop dominant scale makes over a V chord, borrowed for the minor side of the progression.

The natural seventh is never a chord tone here. Over Cm7 it is a semitone from both the root above and the flat seventh below, so it only survives at speed and only on the way past. Slowing down on it is the one way to make the scale sound wrong.

What lands on the beat

Played in eighth notes from the root, the bebop Dorian scale puts C, E♭, G and B♭ on the downbeats — a full C minor seventh chord, one chord tone per beat, for as long as the line keeps running. Seven-note Dorian cannot do this; after one bar its chord tones have moved to the upbeats.

That makes it the scale for a minor seventh chord that lasts a while: a modal tune sitting on one chord, or the two bars of a ii chord in a minor two-five where a plain mode starts to sound like an exercise.

Bebop Dorian and bebop minor are one note apart

Bebop Dorian adds the seventh; bebop minor adds the third. Written out from C, the difference is B against E — one note in eight — and every other note is shared. They land on different chords as a result: bebop Dorian outlines Cm7, bebop minor outlines Cm6.

The two names are swapped freely in method books, which is worth knowing before an argument about terminology. Choose by the chord: if the tune wants a sixth, take the scale with the added third; if it wants a flat seventh in the melody, take this one.

Using it over a minor two-five

In a minor ii–V–i in C, the bebop Dorian scale covers the Dm7♭5 and Cm areas awkwardly and the Cm area well, which is why it is usually taught as a tonic-minor device rather than a two-five device. On the ii chord most players switch to a scale with a flat fifth and keep the eight-note idea for the resolution.

The transferable part is the habit, not the scale: one chromatic note placed so that chord tones fall on beats. Once that is heard, the same trick gets applied to modes this catalogue lists separately, and the four named bebop scales stop being a list to memorise.

Frequently asked questions