Bob,What I heard on the sample was the key of "G" and "E minor". These keys are very similar because they are related as relative major and minor (same notes in common, but different starting note).
Without hearing more of the tune, I think your best bet is to start with a key of "G" diatonic in 1st Position or try a key of "C" diatonic in 2nd Position and stick with the Country Scale-
http://www.harmonicalessons.com/members/scales.php
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Dave Gage
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