The boatswain's pipe has been used in navies for centuries to pass orders when voices could not carry over wind, sails and deck noise. Different tunes were standardized for different duties, and the General Call specifically summons the crew to attention for an important message or order. Because each call is distinct and shrill, sailors learned to recognize them instantly. The sound survives today in ceremonies, training and reenactments, and online it is reused as an instant audio cue for discipline, formality and old-fashioned naval authority.