An essay on the Physics of the Blues Harp
has been published in the conference paper of the FAMA (in Deutsche Gesellschaft für Akustik e. V.
DEGA) workshop in October 2015: Alfred Förtsch, Physics of playing bluesharp in: Musikalische Akustik zwischen Empirie und Theorie, Berlin 2016, p. 35-38.
A free download of the whole conference paper is offered here
Erratum: On p. 35 (right column) read: "For air flowing through a series of appropriately chosen volumes this phase shift can be derived without referring to standing waves or inertia, presupposing ..."