Rap music has many detractors. Today, it is often associated with a culture of crass materialistm, sex, violence and irresponsibility. It wasn't always so. In her thorough and entertaining tour of the "golden age" of rap from 1987 to 1996, McQuillar takes us back to a time when the music voiced the social and political concerns of inner-city youth, reflected their hopes and dreams for the future, and strove to inspire positive social change. When...