related because because billions of people speak languages where tone is the a principle conveyance of meaning, <a href="https://simple.wikipedia.org/wiki/Tone_language" rel="nofollow">https://simple.wikipedia.org/wiki/Tone_language</a>
Paper from PNAS: <a href="https://www.pnas.org/doi/10.1073/pnas.2403262122" rel="nofollow">https://www.pnas.org/doi/10.1073/pnas.2403262122</a>