How Math Unraveled a Beatle's Mystery

One of those "hmmmmm....." things I run across. The Beatle's "Hard Day's Night" starts with a mysterious chord that no one has really figured out.

It took Dalhousie University professor Jason Brown six months and some
advanced mathematical analytical techniques to crack the code

Read about it here

Quite interesting! The article has a sample of the opener, if you don't what this is all about.