Take that, sweet mystery of rock 'n roll. Math has just solved the Holy Grail of Rock: the mysterious "A Hard Day's Night" chord.
Dalhousie University math professor Jason Brown applied Fourier transform to solve the Beatles' riddle: there was a mystery piano!
... the frequencies he found didn’t match the known instrumentation on the song. “George played a 12-string Rickenbacker, Lennon had his six string, Paul had his bass…none of them quite fit what I found,” he explains. “Then the solution hit me: it wasn’t just those instruments. There was a piano in there as well, and that accounted for the problematic frequencies.”
pretty neat though!
I get the impression I'm missing something here.. :P
Let me get this straight - the music was recorded about 40 years ago; at least one of the band members are still alive; presumably, others who helped in the recording are still alive, as well. This is a mystery what instruments were used?