Alan Gross (guitar) and Adam Gussow (harp & percussion) working out on The Crusaders's "Put It Where You Want It" at an outdoor location in Oxford, Mississippi.
Gussow and Gross have just released their debut album as The Blues Doctors, entitled Roosters Happy Hour. You can find it at iTunes, Amazon, and CD Baby:
On this track, Gussow switches from an F harp (played in second position) to a C harp (played in first position).