Recorded in situ: Instrumental music of a funeral song "ddi tok" performed by a monotone fiddle solo "köni". Playing the monochord fiddle "köni" implies that the musician also produces sounds with his voice: a string attached to the string of the instrument is held by his mouth. He hums through gritted teeth. Unpublished sound recordings collected by Jacques Dournes, French missionary and researcher, in Viet Nam in 1964 among the Jörai population: music funeral, different modes of playing aerophones and a phonetic study.