The opening theme for 'Dragnet' is most memorable for sounding like a march, with a horn arrangement that evokes a sense of importance and severity. The narrator assures the viewer that the story they are about to watch is real, but the names have been changed. Sound familiar? That's because 'Law & Order' uses a similar "ripped from the headlines" formula. 'Dragnet' began life as a radio show from 1949 to 1957, and there have been four different television versions over the decades.