Book excerpt: Rarely has a book received such unanimous praise as the Blue's Who's Who. Eighteen years of research and writing, most of it done by Sheldon Harris alone, have produced a reference book that has been accepted in the U.S., England, and Europe, as truly indispensable for anyone seriously interested in the history of country, city, folk, and rock blues. Covering all eras and styles, it features detailed biographies of 571 blues artists, 450 photographs, and hundreds of pages of carefully researched facts.