I mentioned this in class late last week:
The mathematical technique of a Fourier Transform (see pg 230 of the Wolfson physics textbook we use, but also any number of math or physics textbooks) has been used to solve the mystery of the unique opening chord of the Beatles' "Hard Days Night". The mathematical software used to do this is capable of isolating the fundamental and all harmonics of a note played by a particular instrument, which made it possible to find the missing fourth instrument (George Martin on piano) responsible for the sound.
The article in Wired includes a sample of this chord, and a link to the pdf version of the report.
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