Is it possible for someone who has had no musical training whatsoever, and who has never learned the names of the notes, to be known by others to have absolute pitch? The answer is YES! I knew a police officer who was totally unmusical, and never knew the names of the notes, who nevertheless was known to have absolute pitch. How? Well, this was eighty-five years ago, when police stations emitted radio signals, each station having its own individual frequency. The police officer in question was the only one among his fellow officers who upon hearing the radio signal could identify the police station!

— Raymond Smullyan, Reflections, 2015