Follow the link, Henry - Dan Moi do every type of Jew's Harp under the sun - from loud sturdy KHOMUS from the Altai Mountains to exquisitely crafted overtone-rich DAN MOI from Vietnam which don't even require dental contact. They even do Chinese KOU XIANG (HO HO) which come in fanned sets of three & five 'leaves' for melodic playing beyond your wildest dreams.

Nadishana does these too; and he plays them very well indeed:

http://www.youtube.com/watch?v=Br-0gYtT-s0

In the universal realms of the humble Jew's Harp, there are no limits beyond your own imagination...