"BTW - Jaw's Harp, it would seem, is a corruption of Jew's Harp by some centuries... "
Actually, the first written reference was "Jaw-harp," then "Jew's Harp," and both from the 14th Century. Jugdetromp(sp?), in German, Scatiati Pensieri(sp?) in Italian, Dan Moi in Vietnam, etc.
I love 'em.
Bob