Prevalence of congenital amusia. - PubMed - NCBI

Here is the study that puts amusia at 1.5% of population, not the more commonly cited 4%. It does look like a solid study and I appreciate the point noted below; if there's one thing more frustrating than not being able to sing, it's being told that the reason for this is "you're not trying hard enough".

Prevalence of congenital amusia. - PubMed - NCBI:
"the deficit is not attenuated by musical training"

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