Soundies has been called the music videos of the 1940s, but that doesn't begin to describe their cultural importance. It's true that they feature a remarkable range of talent, from big-band luminaries like Duke Ellington and Count Basie to then-emerging stars like Doris Day and Ricardo Montalban, and lesser-known artists of the American nightclub circuit. But Soundies are also a rich, largely overlooked chronicle of American popular culture during...