A bebop locrian ♮2

Construction

Step pattern (W = whole step, H = half step): W-H-W-H-W-W-H-H. Eight notes, formula (intervals from the root): 1-2-b3-4-b5-b6-b7-7.

Bebop Locrian nat2 is the Locrian nat2 scale with one added note: the major 7th between b7 and the octave. This chromatic passing tone gives the scale eight notes, enabling the same beat-alignment principle used in all bebop scales -- chord tones on downbeats in continuous eighth-note lines.

Origin and Relationships

• Locrian is a mode (a scale built by starting a parent scale from a different degree) with b2, b3, b5 -- the darkest of the standard modes. Locrian nat2 raises that b2 to a natural 2, and is the sixth mode of melodic minor (a minor scale with raised 6 and 7).
• The bebop version adds the major 7th between b7 and the octave, the same chromatic device used in bebop dominant and bebop Dorian. Bebop major uses a different insertion point (#5 between 5 and 6) but solves the same rhythmic problem.
• Compare to Bebop Dorian: both add the major 7th, but bebop Dorian has a natural 5 and 6 (serving min7 chords), while bebop Locrian nat2 has b5 and b6 (serving m7b5 chords).

Harmonic Context

• m7b5 (half-diminished): A minor seventh chord with a flatted fifth -- the primary chord this scale serves. Ascending from 1 on beat 1, the downbeats land on 1-b3-b5-b7 -- all four m7b5 chord tones.
• ii in minor keys: In Roman numeral analysis (uppercase = major, lowercase = minor), the ii chord in a minor key is half-diminished. In a minor ii-V-i progression, this scale handles the ii chord.
• Melodic minor connection: Locrian nat2 and the altered scale (used over V7 in the same progression) are both modes of the same melodic minor parent. This shared origin creates smooth voice leading (how individual notes move between chords) across the ii-V resolution.

Characteristic Tones

The intervals that give this scale its distinctive sound:

• 2 (natural second): The feature that separates Locrian nat2 from plain Locrian. Locrian's b2 creates a harsh minor-ninth clash against the root. The natural 2 smooths the scale melodically and makes it far more usable over m7b5 chords.
• b7 and 7 (the chromatic pair): The b7 is the chord tone that completes the m7b5 harmony; the 7 is strictly a passing tone. The cell b7-7-1 is the same chromatic gesture found in bebop dominant and bebop Dorian.

Melodic Applications

Start on a downbeat chord tone and play continuous eighth notes -- the scale places 1-b3-b5-b7 on strong beats, cleanly outlining half-diminished harmony. The natural 2 keeps lines melodic where Locrian's b2 would introduce harshness. The 7 is not a chord tone; move through it quickly toward the octave. Target the b7-7-1 cell for idiomatic bebop voice leading over m7b5 chords.

Practice Seeds

Downbeat chord tones. Play the scale ascending from 1 on beat 1. Confirm that 1, b3, b5, and b7 land on downbeats -- this verifies the beat alignment the added major 7th creates.

The passing 7. Isolate the cell b7-7-1 and use it to approach the root chromatically. Internalize this as the bebop connection to the octave -- it should feel as natural as a leading tone resolving.

Over minor ii-V-i. Use the scale over the ii chord in a minor ii-V-i. Listen for how the natural 2 smooths the line compared to plain Locrian -- then try the altered scale over V7 and hear how both scales share a melodic minor parent.

Compare to Locrian nat2. Play Locrian nat2 over an m7b5 chord, then play bebop Locrian nat2. Hear what one added note achieves -- rhythmic alignment through a single chromatic passing tone.