Mexico is a noisy place. Unless your cave is very high up the mountain, far beyond human habitation, noise is an integral part of your life. Certain kinds of noises are universal, occurring with equal frequency and comparable decibel levels in both urban and rural locations. The chief among them is church bells, which ring out several times daily, calling the faithful to mass, summoning the villagers to gather, announcing an emergency, or displaying the high spirits of a drunken parishioner who, at five in the morning, wishes to share his happiness with his neighbors. Fireworks run a close second.
Third place goes to automotive noises, although their character varies with location.
Squealing bus brakes are common to both places. So is the neighbors' radio, playing at full blast. Man's best friend, stationed on the roof of most houses, joined together in choruses of frenzied barking, provides the moon, the casual stroller in the street, and the insomniacs among us with examples of his devotion to duty. The rest of the noises vary, depending on location. Animals, particularly burros and chickens, are more common outside the city, and ghetto blasters less so.