The lead single from Australian electronic music producer Flume's second album, Skin, this was released on January 16, 2016. The song became his first #1 on the ARIA Singles Chart and also peaked at #2 in New Zealand.
The song features vocals by Kai, a singer-songwriter from Toronto, Canada. Kai's other credits include co-writing the title track of Jessie J's Sweet Talker album and featuring on Skrillex and Diplo's Jack Ü cut entitled "Mind."
Flume recalled the story of the song: "Kai and I were sending ideas back and forth online, then met up in New York and went into the studio. We laid down some chords and started an idea but weren't feeling inspired. So we went out into the night for a few hours and when we returned, it all started to come together."
Kai's lyrics come from a personal place. "It's about a moment in my own life when everything was going really well and my inner saboteur tried to do what she does best," she explained. "At the end of the day we are all human and flawed and I felt like I needed to be as real and as candid as possible. I am absolutely in love with this song."
The lyrics for "Mary, Did You Know?" were written by Christian singer and comedian Mark Lowry, after his pastor asked him to write a Christmas musical for their church. Southern gospel musician Buddy Greene later added music to his words.