PBS’ Jazz series two years ago was a big success. Will the same happen for the new Blues series? “The dust from Ken Burns’s Jazz has settled enough after 2½ years to allow some consideration of its impact – its successes and its consequences – now that Martin Scorsese’s The Blues is on the air. Foremost among those successes are the sales for the Burns series CDs on the Verve and Columbia/Legacy imprints – a five-disc boxed set and 22 single releases devoted to individual artists…”