Taylor Swift's given us a brief glimpse into how her forthcoming duet opus with Ed Sheeran came to be.
Chatting away to the BBC about 'Everything Has Changed', the 'Mary's Song (Oh My My My)' chanteuse said it was all fairly easy going to be honest.
"Both of us are really open so if he (Sheeran) doesn't like a phrasing he'll tell me and if I don't like a chord, I'll tell him."
Fascinating stuff, do go on…
"It's really cool to have an honest channel where he'll be like, 'no' and I'll be like, 'yep' and he'll be like, 'no', and I'll go 'OK I'll change it'."
A real meeting of minds.
But surely getting the schedules together was a complete nightmare?
"I had management reach out and at the same time he was having his management reach out to me because we both wanted to work together at the same time," she explained.