Michelle,
Sonny Terry's dad used to play Jew's harp to relax after a long day in the cotton > fields. Sonny picked it up pretty well.
You can listen to samples of a 1961 album called
'Sonny Terry's New Sound' here: http://www.smithsonianglobalsound.org/containerdetail.aspx?itemid=597
A tip of the cappuccino,
Marc