(Source : http://www.taxi.com/transmitter/1312/geoff-emerick-interview.html)
Geoff Emerick (Abbey Road recording assistant) : It was a George Harrison guitar line on Misery, and it needed it a different sound to make it more interesting. I realized at this point that what George [Martin] did is he played the tape at half speed and put the little piano part, which was the same as the guitar part, underneath to play along with the guitar. When you play it back at normal speed, the harmonics are different - and it has that special sound. So from that moment on, as far as I was concerned, I knew that you could create things from doing things like that. That's when the seed was planted for me, straight from George.
(Source : http://pitchfork.com/thepitch/1056-beatles-engineer-geoff-emerick-on-how-george-martin-changed-the-game/)
Paul McCartney : A Taste Of Honey was one of my big numbers in Hamburg - a bit of a ballad. I t was different but it used to get requested a lot. We sang close harmonies on the little Echo mikes, and we made a fairly good job of it. It used to sound pretty good, actually.
(Source : Anthology tv series)