Chris Martin listens to "a lot of Katy Perry". 
The Coldplay frontman loves to put on some of the 30-year-old singer's hits on, and admits after listening to many of Firework hitmaker's tracks he thinks her music sounds a lot like grunge outfit Nirvana. 
Speaking about the creative process behind Coldplay's hit A Sky Full of Stars, he said: "I'll tell you the truth, I was listening to a lot of Katy Perry.
"A lot of her songs have the same chord sequence the whole time … and then I realised a lot of other people have done that, Nirvana being a classic example, with Smells Like Teen Spirit."
While Chris' lyrics are often the subject of plenty of praise, the 37-year-old star insists he doesn't think much of his own song words. 
Speaking in Beat x Beat video, which can be seen on the official Beats by Dre You Tube channel, he added: "I'm not the most poetic of lyricists, but I know what feels right."
Chris admitted A Sky Full of Stars was inspired by him also listening to a lot of electronic dance music and he was glad to get some help from Swedish DJ Avicii. 
He said: "I asked Avicci for help and he said 'yeah', with his backwards cap, and said, 'That'll be $12 million' … no he didn't."