Hornbostel - Sachs
Side-blown labrosones
The air itself is the vibrator in the primary sense. The standing waves are significantly confined within the instrument itself. The air-stream passes through the player's vibrating lips, so gaining intermittent access to the air column which is to be made to vibrate. The body of the instrument is a plain tube, with the embouchure in its side. S. America, Africa.
Side-blown curved labrosones