https://news.uchicago.edu/explainer/what-is-perfect-pitch
紫檀上應該很多娃學音樂，所以比例比較高？
A commonly cited number is that approximately one in 10,000, or .01% of people, are thought to have perfect pitch. However, perfect pitch may actually be considerably more common: One recent review suggested that 4% of music students have the ability, and people with perfect pitch can be found in the general population, if you know how to look for them, according to Nusbaum, a leading expert on the science of auditory learning
