Pitch is not the same as timbre or tone. People have different anatomy which contributes to different tones. Just hear the trumpet and a trombone. Both are wind instruments, and also brass instruments. But they sound way different because of how they were built. Or even two guitars with different set of strings and different body shape, you’ll notice different qualities of their sound. The same goes for humans. Every slight difference of the shape of the mouth, head and larynx contributes to a unique sound for each person.
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