Anyone who has ever heard a Billie Holiday record knows the sound of her voice--sad, sexy, always relaxed but securely aware of the beat. Conveying a poignancy that cut to the heart of a song, she redeemed even trivial material with her impeccable sense of dramatic phrasing and time. The well-known tale of her lifelong battle with drugs has obscured the artistry that has made her one of the most revered singers of the twentieth century. Everyone from Frank Sinatra (who in the 1950s called her "unquestionably the most important influence on American popular singing in the last twenty years")...