Такого практически не бывает, чтобы совсем не было.

Languages like Mandarin rely very heavily on tones since the pitch frequency and fluctuation of a word is intimately connected with the meaning. One popular set of words to showcase this is (Mâ, Mā, Mà, and Ma) which can mean mother, hemp, horse, or a reproach depending on the inflection and pitch. This relationship with tone is so hardwired in native speakers that their day to day pitch consistency is identical. Professor Deutsch made audio recordings of people speaking a few chosen words on multiple days and the pitch was indistinguishable one day to the next. See what I mean? Totally mind blowing stuff! It’s like me saying “good morning” everyday but having the frequency sound identical (regardless of whether I am sad, happy, tired, or hungry) every single day. What does this have to do with perfect pitch? In the US and other Western nations only about 1 out of 10,000 people have perfect pitch. People who were raised speaking and listening to a tone language have been shown to be 9 TIMES more likely to have perfect pitch.
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