The Faber Companion to 20th-Century Popular Music

Similar in scope to the All Music Guide, this hefty text includes entries on pop, rock, country, blues, jazz, Broadway and soul musicians, though in this case they are listed together alphabetically, rather than grouped in sections. This has the advantage that it has only two authors, and thus a clearer editorial focus (humorous when, as Brits, they include a few long passages on Euro bands that no one on this side of the Atlantic has ever heard of...) No graphics, but good writing, and admirably inclusive. Nice glossary of styles in the preface, too.