Each Saturday, WHRO-FM presents Harmonia, a one-hour radio program of early music that takes listeners back in history to the cathedrals, fairs, and stages of the past, offering historical background as documented by musicians of the periods. This week, we have a rather unusual program, featuring music by astrologers, cabinet makers, poets, and others who ducked, or bucked, their non-musical lives to compose music of lasting power.  Tune in Saturday at 6 AM or 11 PM for Harmonia.