In the heyday of low-budget television and scrappy genre filmmaking, producers who needed a soundtrack for their commercial entertainments could reach for a selection of library music: LPs of stock recordings whose contents fit any mood required. Though at the time, the use of such records was mostly a cost-cutting maneuver for productions that couldn't afford to hire their own composer, the industry soon took on its own life: library publishers became major financial successes, and much of the work they released was truly extraordinary. In fact, many of these anonymous or pseudonymous scores-on-demand were crafted by the some of the greatest musical minds of the late 20th century-expert musicians and innovative composers who reveled in the freedoms offered, paradoxically, by this most corporate of fields.