Google: "As early as 1653, the British Navy utilized flags to send messages between ships by varying their placement and arrangement."
Google: "The practice of using church bell signals to call people to worship and mark time is widely attributed to Paulinus of Nola, a Bishop of Nola in Campania, Italy, around AD 400. He is credited with introducing the first church bells into the Christian Church."
Church bells can be heard for miles.
Yes, but the British Navy didn't have a system of relaying messages from one station to another over long distances, and church bells (mentioned in the text I quoted from Gleick (?) in my comment upthread) normally don't carry messages at all; everyone knows the sequence they will be rung in before they ring, so the information content is zero. You could hypothetically use them to relay coded messages over long distances, but to the best of our knowledge, nobody did.
Similarly, Archimedes had mirrors, even if he may not have burned ships with them, so he could have invented the heliotrope or heliograph, but in fact that had to wait for Gauss.
The first telegraph relay system in Europe used a semaphore system similar to the British Navy's, but it wasn't deployed until 01792: https://en.wikipedia.org/wiki/Optical_telegraph At that point the relaying of drum messages over long distances through many stations was already practiced in parts of Africa.
Church bells were used to mark time, and announce major events like the death of the king and probably a few others. Those are information content - but of course very limited. The bells weren't for entertainment (although I enjoy hearing those massive gongs, and church bells often appear in recorded music).
It's a bit hard for me to imagine drums working in medieval Europe. I don't think they would propagate as well as the sound of church bells. Heck, I could identify church bells from miles away, nothing else carries like that. Outdoor concerts don't seem to carry far at all, for example.
>I don't think they would propagate as well as the sound of church bells. Heck, I could identify church bells from miles away, nothing else carries like that.
As with most discussions, the nuance matters. Anecdotal evidence is trumped by science.
Drums tend to have lower frequencies than church bells. All else equal, lower frequencies generally travel farther because they have longer wavelengths (less diffraction means they can go around objects better), less attenuation, and less absorption.
As an example of the application of low frequency long distance communication in nature, elephants use sub-sonic (to humans) frequencies to communicate many kilometers away.
That's true! The king's death is a message!
Generally lower frequency sounds are less attenuated by air, and they diffract better around obstacles, and drums are better at producing low-frequency sounds. So I'd think that drums would carry better than bells over many kilometers.