Sankyoku

Sankyoku is a Japanese chamber ensemble consisting of three instruments: the koto (thirteen-stringed zither), the chuzao shamisen (medium-necked plucked lute used in jiuta), and either the shakuhachi (end-blown bamboo flute) or the kokyu (bowed three-stringed fiddle). The three play essentially the same melody, but each ornaments and times it slightly differently — a heterophonic texture distinct from Western quartet writing where each instrument has its own assigned line. The koto's dry plucked attacks, the shamisen's sharp plectrum strike against skin, and the shakuhachi's airy low register create three contrasting timbres on the same melodic skeleton. Tempos breathe; the moment when three lines converge moves the music's center of gravity.

Sankyoku coalesced in the late Edo period from jiuta (a shamisen-and-voice tradition of the Kyoto-Osaka region) plus the koto and shakuhachi. The configuration solidified in the 17th-18th centuries as house-concert chamber music. In the 20th century the blind composer Miyagi Michio (1894-1956) opened the koto repertoire to Western tonal and orchestral influences while preserving the language of sankyoku; his 'Haru no Umi' (Spring Sea, 1929) became the most internationally recognized koto piece.

On 'Haru no Umi' (1929), the koto and shakuhachi appear to follow the same melody, but pay attention to the small gaps in timing — the shakuhachi often sustains a single tone while the koto has already moved to the next, and the ma (interval of silence) between them defines the music. Notice the koto technique of pressing a string behind the bridge after plucking to bend the pitch upward.

'Haru no Umi' in the two-instrument koto-shakuhachi version (1929 or later) is the simplest entry. Then compare with the full three-instrument sankyoku arrangement to hear how the shamisen reshapes the texture.

Miyagi Michio toured Europe in 1936 and performed 'Haru no Umi' with the French violinist Renee Chemet — among the first international airings of koto music outside Japan. He died in 1956 after falling from a moving overnight train.