Ca Trù

Ca trù is a Vietnamese sung poetry form for a female vocalist (đào nương) accompanied by the đàn đáy (a three-stringed long-necked lute with a deep trapezoidal body) and a small set of wooden clappers (phách) which the singer strikes herself. The audience member or patron plays a small drum (trống chầu) to applaud (or correct) the performance in real time, making the form a three-way conversation. Tempos sit slow to moderate, with elaborate melismatic ornamentation, and the vocal line is dense with microtonal inflections. Texts are classical Vietnamese poems in fixed prosodic forms (especially hát nói), and the style demands literary as much as musical literacy from singer and listener.

Ca trù dates to the fifteenth century in the Red River Delta of northern Vietnam, where it developed in entertainment guilds (giáo phường) for the literati and aristocratic patrons of court and temple. Its golden age ran through the Lê and Nguyễn dynasties; by the early twentieth century the form had migrated into Hanoi's tea-house culture (hát ả đào). The tradition nearly died out under the Democratic Republic of Vietnam after 1954, when the social context that supported it was dismantled. A small number of master singers — Quách Thị Hồ above all — survived to teach a new generation. UNESCO inscribed ca trù on its list of intangible heritage in urgent need of safeguarding in 2009.

Notice the three-way exchange: the singer's voice and phách clappers, the đàn đáy lute, and the patron's drum interjections. The drum is not background — it is active commentary on the performance. The melismatic vocal style stretches single syllables across many pitches, sliding through microtonal turns that resist transcription into western notation.

Recordings of Quách Thị Hồ (1909-2001), the master singer credited with preserving the tradition through the late twentieth century, are the canonical reference. The 2009 UNESCO documentation includes representative performances.

The phách is a thin oblong block of wood struck with two small mallets — and it is played by the singer herself, not a separate percussionist, so the vocalist is simultaneously singing and providing her own rhythmic foundation. This double duty is one reason the form takes years to master.