Basuri horns are musical air horns commonly fitted to buses in Indonesia, where drivers use tuneful blasts to announce arrivals, greet fellow drivers and entertain passengers. The sound became widely known outside Indonesia through bus-spotting videos and social media clips shared by enthusiasts, who film buses arriving at terminals and on highways. Its cheerful, song-like quality made it instantly recognisable and easy to reuse in memes and travel edits. It remains popular because it captures a distinctive part of Indonesian road culture in just a few seconds.