It is claimed that nobody has ever been able to reproduce, as in reverse engineer, the opening chord of The Beatles' "Hard Days Night" - the breakdown of the chord has remained a mystery: Until know, as the mystery has been solved - not by a musician, but by a mathematician.
Here's the article explaining how the mystery was solved.
The opening chord can be heard here and here (two varieties).
Here's the article explaining how the mystery was solved.
The opening chord can be heard here and here (two varieties).

