What iconic procedural drama, created by Dick Wolf, is known for its distinctive "dun-dun" sound effect and its two-part structure, focusing first on the police investigation and then on the prosecution in the courtroom?

Law & Order (Review) is the iconic procedural drama that perfectly matches the description, renowned for its distinctive "dun-dun" sound effect and its unique two-part narrative structure. Created by Dick Wolf, the show revolutionized the crime drama genre by dedicating its first half to the police investigation of a crime, typically a murder, and the apprehension of a suspect. The second half then shifts focus to the prosecution of the defendant by the district attorney's office in the courtroom, offering a comprehensive look at the criminal justice system. This innovative approach, which often drew inspiration from real-life headlines, aimed to present a more realistic portrayal of law enforcement and legal proceedings.

The memorable "dun-dun" sound effect, often referred to as "The Clang" by its composer Mike Post, serves as a powerful auditory transition between scenes, particularly when shifting from the police investigation to the legal proceedings. Post deliberately crafted this sound to be distinctive and jarring, describing it as "the stylized sound of a jail cell locking." It's a complex audio creation, not a simple recording, blending various elements such as a jail door slamming, a gavel, and even a recording of hundreds of Japanese men stomping their feet on a wooden floor. This instantly recognizable sound has become synonymous with the series and is a key part of its enduring legacy.

Dick Wolf's vision for Law & Order, which premiered in 1990, was to create a drama that emphasized the cases rather than the personal lives of the characters, a departure from many other shows of its time. This focus allowed the series to explore complex social, moral, and legal dilemmas within each episode. The success of the original Law & Order led to the creation of a vast and popular franchise, including numerous spin-offs like "Law & Order: Special Victims Unit (Review)," solidifying its place as one of the most influential and long-running dramatic shows in American television history.