'Scratch' Scratch is the name of a new documentary film chronicling the evolution of the hip-hop DJ. The film's soundtrack is a distilled version of the documentary, laced together with clips of live performances and commentary from DJs. Guest host Liane Hansen talks with Bill Laswell, the producer of the soundtrack, about the idea of "turntablism" and "DeeJaying." (7:30) The CD is from TransparentMusic. For more, visit the movie Web site and the Transparent Music Web site.