Herbie Hancock has forged a career that has pushed the envelope of jazz music and, in doing so, has reached a wider audience than any other jazz musician ever has. His 1973 album, Head Hunters, is the biggest selling jazz record in history. This Chicago native is easily among the most eclectic musicians of any genre. Hancock has worked within the field of jazz playing free, bebop, and fusion styles, and outside performing world music, hip-hop, funk, and dance music. Along with Miles Davis, he helped create the style known as jazz fusion in the late 1960s and, as a solo artist during the early 1970s, Hancock was one of the first to pioneer the use of synthesizers within jazz. And on his 1983 hit single, "Rockit," he introduced the mainstream pop world to turntable scratching, an element of hip-hop music that uses a turntable and...