When a radio station decides to flip formats, or make major changes to it's image or programming, it wants to gain all the attention it can from the general public. One method is to "stunt." Stunting is when a radio station does something totally radical, unusual, and unexpected by the general listening audience. This can vary from looping one song for several days, a clicking clock, or playing Christmas music in July. Examples in Salt Lake include now defunct Fever 107.9's looping of the BeeGees' Night Fever, before it's initial sign-on, or Hot 94.9 playing construction noises before changing it's name to ZHT. One excellent resource for station sign-on and stunts is Radio-Info.com's Format Change Archive.
Stunting in radio broadcasting occurs when a radio station abruptly begins broadcasting seemingly uncharacteristic programming or making grandiose claims regarding itself or its competitors to generate attention or word of mouth. This sort of staging is temporary and often used when a station is permanently changing format and call letters, is moving to an entirely different position on the dial, or changes ownership.