The Harmonic Kiss by Bach Yen & Tran Quang Hai

The Harmonic Kiss is a technique of overtones which enables two persons to produce overtones even if they don't khow this technique .
One person just emits a "u" sound while the second person catches this sound in his mouth stopping breathing which is used as an external resonator . By modifying the volume of this resonator, we can hear 2 or 3 overtones (H2,H3, and H4). This excercice invented by Bernard Dubreuil in 1987 and developed by Tran Quang Hai in the field of music therapy to solve married couples' psychological problems .This is just an experiment of how to use overtones in other fields by Tran Quang Hai.
The exercice is practised by Bach Yên and Tran Quang Hai
Filmed at their home on January 4, 2009.