Law and Order premiered on NBC in 1990, created by Dick Wolf, and its opening became one of the most recognisable in television. Actor Steven Zirnkilton delivers the spoken introduction about the two separate yet equally important groups, while composer Mike Post wrote the driving theme. The format stayed consistent across the original series and its spin-offs, so generations of viewers learned to associate the sound with a new case beginning. Online, creators reuse that authority for parodies, edits and everyday dramas that mimic a serious investigation.