Interestingly, that is how normal people can end up with "perfect" relative pitch. Many people can almost instantly remember the notes of their favorite songs a

Interestingly, that is how normal people can end up with "perfect" relative pitch. Many people can almost instantly remember the notes of their favorite songs and so using those as anchors give people without perfect pitch the ability to determine chord/key/etc via relative pitch. A second or two of a song is shockingly good at triggering your memory of songs you know well.