On the face of it, Katy Perry doesn't feel like the most obvious source of inspiration for Coldplay, but according to Chris Martin we wouldn't have 'A Sky Full Of Stars' without her.
In a new interview with Beats, Chris revealed that he was listening to a lot of Katy's music when he wrote the track.
The interview gives a pretty awesome insight into how Coldplay construct their biggest anthems.
You can watch the full interview right here.
'A Sky Full Of Stars' features on Coldplay's album 'Ghost Stories', which dropped earlier this year.