On of my best memories of having stretched ears was when I was walking in the Yorkshire Moors and the wind was whistling through the holes in my ears.

BBC: Ear stretching: 10 of your stories

You'll be in a building that has maybe three other studios, and you'll see Pharrell walking through the hallway, and maybe he'll pop in and something random will happen that'll wind up being on the album.

BBC: John Legend talks 'Love In The Future'