Ed Sheeran and Taylor Swift have revealed the extreme lengths Swift goes to keep her songs secret.
In a recent interview, Sheeran spoke about the effort to keep Swift's songs from being leaked and it sounds like something out of a spy film.
He told Brazilian magazine Capricho: "I remember when I did a song with [Taylor] for her album, I was in San Francisco, and they sent someone with a locked briefcase with an iPad and one song on it.
"They flew to San Francisco and played the song I've done with her and asked if I like it...I was like, 'Yeah,' and they took it back. That's how I hear it."
But that's not all.
In some recently released behind the scenes footage of the End Game music video, Swift revealed not even the dancers in the video get to hear the song while they're dancing to it.
She wears earbuds so she can hear the track, while everyone else is stuck with a "click track" to keep the song's rhythm and that's it.
"I commend them fully because they've been pretending like there's music playing when there's not...It's incredibly hard work," Swift says.
See the awkwardness for yourself - skip to 3.30 to get to the good stuff.