In his initial discussion of tone languages in Music, Language, and the Brain, Aniriddh D. Patel writes briefly of the Chinantec, an indigenous people of southern Mexico, who utilize a whistled speech in addition to their tonal, spoken word. They use whistle combinations “of tone and stress distinctions to communicate messages with minimal ambiguity.” And he’s not talking about a hey! or an over here! or some ridiculous catcall. He’s suggesting they actually have a whistle language. . .
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