This is an alarming area to get into discussion on. My current thoughts are that the 'Phillipine mouthbow' I gave to Animaterra's school is in fact a Phillipine wooden jaw's harp, rather than a mouth bow. I've met a couple of world experts (never even whisper the word fanatic) on the jaw's or jew's harp or trump, and they were together on a concert programme with me in an old Netherlands town called Veere in September. One, Lindsay Porteous, is a Scot and told me he was recently a judge at the US Jew's Harp Championships (I have the title inaccurate, I expect). The other is a Dutch radio producer who once broadcast an eight hour (count them) programme on the jew's harp. The Dutch guy and his jew's harp quartet played some startling music based on harmonic and overtone possibilities rather than on melody. Each of the quartet had some 60 instruments. Lindsay however has hundreds.
I must stop. I have already said too much. I refuse to tell about the Rasputin-like character who sold me a metal one from the far north of Russia when I met him on a Moscow street in October.