In western music overtones 
are experienced as an aspect of the timbre of a musical instrument. In Asian music overtones are listened as discrete tones above the fundamental frequency . Overtone singers use the overtones of the human voice to create melody lines above the fundamental tone.
The Hang is a musical instrument with strong overtones. The Ding and each tone field are tuned in a special way. Besides the fundamental frequency the first and second overtone, the octave and the compound fifth (the quint above the octave) are tuned in.
You can discover these overtones by tapping on different areas of the tone fields. After Exploring the Hang’s overtones, you will begin to hear the overtone music above your Hang music.
Read the article in the Hang Library:
Discover the Hang’s Overtones