Witches on the Road Tonight by Sheri Holman

This book deftly links the story of a young boy who encounters two WPA artists while growing up in Appalachia with that of the way the family of a small time television entertainer is torn apart when they bring a foster boy into their midst. There's a lot of piecing together that the reader has to do for herself, but I especially enjoyed the parts set in rural Virginia. The television show, which seems to be a sort of low-budget, local market Mystery Science Theater 3000, features Captain Casket (CAP/TAN/CASKT, the Casketeers sing, in a parody of the Mickey Mouse Club song that Disney would shut down faster than you can say "Jimney Cricket" today), and is one of the most entertaining and imaginative bits of the story.