Chicago Fire premiered on NBC in 2012 as the first series in the One Chicago franchise, following the firefighters and paramedics of the fictional Firehouse 51. Its station alarm became a recognisable cue for fans because it marks the moment a dispatch call interrupts everyday firehouse life. Clips and edits shared online turned that brief tone into a standalone sound for firefighter tributes, roleplay videos and reaction edits. It remains popular because viewers instantly associate the alarm with Engine 51, Truck 81 and Squad 3 responding together.