Humans have also used drums, often wooden slit gongs, for long-distance communication, relaying the message every few kilometers. Although talking drums are no longer a leading communications technology (telephone lines, radio, and fiber optics carry farther and have higher bandwidth) they are still in traditional and ritual use, much like handwriting, candles, IRC servers, and <table> layout. The West African versions of this form of communication are the best known, but it has been used in many parts of the world.

Transposed into the world of radio, this approach is known as "ultrawideband" or "time domain radio".

https://en.wikipedia.org/wiki/Talking_drum

https://time.com/archive/6771186/science-drum-telegraphy/ 01942: "Any pulp writer worth his salt knows that when his locale is darkest Africa he can’t use too many drums. In a good standard plot, talking drums warn fierce natives of the unsuspecting white man’s approach while the reader shudders. Last week in Natural History Dr. Albert Irwin Good, who understands Bulu and related African dialects, published the first popular article on the linguistics of drums, the complicated telegraphy whereby African drummers talk across the jungle."

https://www.tandfonline.com/doi/pdf/10.1080/00437956.1945.11... 01945: Drum-signaling in a West African Tribe, by George Herzog. "The use of musical instruments for purposes of signaling is very widespread, and definite systems of communication are or were based on it in native Africa, Middle and South America, and the Pacific. The African systems are the most elaborate and often serve for free conversation; their existence is well known to the anthropologist and the traveler, hut they have been little investigated from the linguistic point of view, and still less in their social setting."

https://pen.org/drums-that-talk/ (Gleick?) "For a long time Europeans in sub-Saharan Africa had no idea. In fact they had no idea that the drums conveyed information at all. In their own cultures, in special cases a drum could be an instrument of signaling, along with the bugle and the bell, used to transmit a small set of messages: attack; retreat; come to church. But they could not conceive of talking drums. (...) That result was a technology much sought in Europe: long-distance communication faster than any traveler on foot or horseback. Through the still night air over a river, the thump of the drum could carry six or seven miles. Relayed from village to village, messages could rumble a hundred miles or more in a matter of an hour."

https://old.reddit.com/r/todayilearned/comments/50p1b7/til_t... "I spent a good chunk of my childhood in Nigeria and as a result of learning to play the drums I happened to pick up the talking drums as well and even though my spoken Yoruba is absolutely horrendous now (I can still understand), I can still speak Yoruba with the talking drums."

https://www.youtube.com/watch?v=JT3tIJzAkcc a short message with a transcription