I hadn't actually heard of the Chicago work before, but this is interesting: "These results suggest that the acquisition of intermediate absolute pitch ability

I hadn't actually heard of the Chicago work before, but this is interesting: "These results suggest that the acquisition of intermediate absolute pitch ability (significantly above chance but below ‘‘true’’ AP performance) depends on an individual’s general auditory working memory ability" [1] Apparently learned absolute pitch wasn't as accurate as "true" perfect pitch. [1] https://www.academia.edu/download/52277554/Auditory_working_memory_predicts_individ20170323-16487-b4aqoz.pdf https://www.academia.edu/download/52277554/Auditory_working_...