This first episode is based upon a circular Mixolydian Mode chord progression:
A / / / | / / / / |D / / / | / / / / |Em7 / / / | / / / / |D / / / | / / / / :||
It is based upon improvisations done from November 2006 to the present under the Modal-Improv framework, which is basically a list of about 25 simple, circular modal chord progressions.
These little progressions are great for improvising around, especially on the dulcimer where you can't really hit any (or many) "wrong" notes.