It's all about the beat in Bjorn Klein's new book about music history's most exciting era of underground dance music culture. Klein digs deep into the sexy code of the DJ's music, and expertly demystifies the sound of New York City's most notorious underground clubs in the 1970s. As strings and synthesizers whirl around frantically, as the bass guitar sends out funky waves of electrifying vibrations and as the beat of the bass drum spurs you...