Mikky Ekko, who penned Rihanna's track 'Stay', has opened up about the story behind it and explained his reaction upon discovering that she chose to record it. 

The talented singer-songwriter told Gigwise that he "freaked out" when the Bajan beauty confessed that she had laid down vocals on the song and admitted that it relates to her just as much as it does to himself:

"The track had become so special to me as well, and knowing what the track means to me and what I think it means to her too, it really worked."

"It speaks to such an intimate side of her that is so rare and so far removed from what people think of her."

"I met up with some of her people in LA. She came out, we met, we hugged and talked for a minute about the song, she said 'Oh, just so you know I've cut the vocal,' and I was like 'WHOA!', and of course I said 'that's no problem' - even though I was a little freaking out."

Watch Rihanna perform the haunting cut on Saturday Night Live below: