James Blake told Pitchfork
how the collaboration came about: "Beyoncé came to the studio, and I was sitting at the piano when I met her. She was just lovely. I came up with something to go with an idea she had; I just embellished her melody. I think the idea was to use some of her lyrics, but I didn't realize that - I misunderstood and did something entirely different from what she wanted. But it didn't matter, because she really liked it, and they ended up using [my version]."
"Blue Ivy was there, too, which was nice. She was singing along to the song, which was a huge compliment, because kids just don't have any pretence whatsoever."