The song is titled ‘Everglow’ and is said to be a "ballad about a relationship's enduring spark”, according to Martin, who recently spoke about the CD with the Wall Street Journal. The couple’s kids, as well as other family members, will also be heard as a choir on some tracks, making the record a real family affair.
"Everyone who got asked to sing on our album has an important part in our lives," Martin told WSJ. "I don’t want to get too hippie, but what I’m trying to learn in my life is the value of every human."
Even more surprising than their collaboration, though, will be a cameo from Blue Ivy. Yes, Jay Z and Beyonce’s little girl. Huh, how did that happen?!