Construction
Step pattern (W = whole step, H = half step, M3 = major third, 4 half steps; m3 = minor third, 3 half steps): W-H-M3-W-m3.
Formula (intervals from the root): 1-2-b3-5-6.
Kumoi is a five-note Japanese pentatonic scale. Like Hirajoshi, Kumoi can be understood as a Western seven-note mode with two degrees removed -- here, Dorian minus the 4 and b7. Compare to minor pentatonic (1-b3-4-5-b7): Kumoi replaces the 4 and b7 with 2 and natural 6, creating a sound that is minor but unexpectedly warm.
Origin and Relationships
- Parent: A subset of Dorian (a minor mode known for its natural 6: 1-2-b3-4-5-6-b7). Kumoi omits the 4 and b7, preserving the natural 6 that defines Dorian's warmth within a minor context.
- Family: Japanese pentatonic. Like Hirajoshi, derived from traditional Japanese string tunings. The M3 gap (b3 to 5) and m3 gap (6 to octave) give it the wide spacing of Japanese scales, but the m3 closing interval is tighter than Hirajoshi's M3, making Kumoi feel warmer.
- Nearest neighbor: Hirajoshi (1-2-b3-5-b6). Same four notes on degrees 1, 2, b3, 5. Only the 6th degree differs -- Kumoi has natural 6, Hirajoshi has b6.
Harmonic Context
- Drone-based: Works best over a sustained root or 5th. The b3 and natural 6 create a gentle tension that does not demand resolution.
- min6 (a minor triad with an added 6th: 1-b3-5-6): The scale spells a complete minor 6th chord. This is its most natural harmonic home.
- Modal: The missing 4 and b7 remove subdominant and dominant function, leaving a still, open quality.
Characteristic Tones
The intervals that give this scale its distinctive sound:
- 6 (natural sixth): The defining tone. This is what separates Kumoi from Hirajoshi and from Western minor pentatonic. The natural 6 against b3 creates the Dorian-derived warmth that sounds distinctly Japanese rather than bluesy or dark.
- b3 (minor third): Establishes minor quality. Paired with the natural 6, it mirrors the Dorian color -- minor but not heavy.
- 2 (major second): Where minor pentatonic leaps from 1 to b3, Kumoi steps through 2 first. This stepwise opening softens the scale's entry.
Melodic Applications
The natural 6 is the melodic key -- phrases that highlight the b3-to-6 span carry Kumoi's warmth. Over a drone, the W-H movement from 1 to 2 to b3 acts as a gentle pickup before the M3 leap to 5. Let notes ring and sustain; the scale's wide intervals reward patience and space over speed.
Practice Seeds
The defining sixth. Play b3 and 6 as a pair, listening to the interval between them. Train your ear to recognize this warm minor-to-major-sixth sound -- it is Kumoi's signature.
Kumoi vs. Hirajoshi. Play both scales from the same root, pausing on the 6th degree of each (6 vs. b6). Hear how one note shifts the mood from warm to dark.
Minor pentatonic contrast. Alternate between Kumoi and minor pentatonic from the same root. Notice where 2 and 6 replace 4 and b7 -- different notes, completely different character.
Drone with space. Improvise over a sustained 5th using long, ringing tones. Experience how Kumoi rewards sparse phrasing -- the wide gaps between degrees create a contemplative Japanese quality.