A melodic jingle rings out, an agreeable tune that immediately captures your attention. It's the sound of a public address system notification tune, a universal signal that an announcement is about to be made. The clear, harmonious notes echo through the air, amplified by a microphone and transmitted through the tannoy. The tune itself is short, crisp, and concise, designed to alert everyone within earshot that important information is forthcoming. As the tune fades away, the air buzzes in anticipation of the imminent announcement. It's a familiar sound that instills a sense of routine and organization, a reminder to tune in and listen carefully.