While we don't have ancient audio, we can learn something about how a language was spoken by analyzing poetry with strict pronunciation rules. There's research

While we don't have ancient audio, we can learn something about how a language was spoken by analyzing poetry with strict pronunciation rules. There's research in Chinese (I believe the original researcher was named Chen Li) to reconstruct how Chinese words used to be pronounced by analyzing poems that were supposed to rhyme but no longer do. https://en.wikipedia.org/wiki/Historical_Chinese_phonology https://en.wikipedia.org/wiki/Historical_Chinese_phonology