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 of an evening, 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."