Ice cream vendors have used amplified music to announce their arrival since the mid twentieth century, when trucks replaced bells with looping music boxes and later electronic speakers. Different regions adopted different public domain tunes, so no single melody defines every truck, but the tinny looping style became universal. Online, recordings of that sound were shared as a stock effect for videos, games and animations needing an instant summer cue. It remains popular because listeners recognise the meaning in a second, even without seeing a truck on screen.