Vargan Coucou Ka-ku

The **Cuckoo technique** on the jaw harp is produced by making rapid **inward clicking or popping sounds with the tongue** against the roof of the mouth, creating a bird-like call."
* "It involves **quickly retracting the tongue** from the palate/alveolar ridge while **inhaling**, generating a sharp, percussive 'cuckoo' sound."
* "A characteristic **'kook-kook'** sound is made by **flicking the tongue** upwards and backwards in a quick, snapping motion during inhalation."