Coldplay frontman Chris Martin is calling in a favour from his pal Jay-Z as he wants the rap superstar is to feature on a remix of the band's track Lost!The singer and his wife Gwyneth Paltrow are good friends with Jay-Z, and the musical males have previously teamed up to work on the song Beach Chair, from the 99 Problems star's 2006 album Kingdom Come.Now Jay-Z, real name Shawn Carter, is to return the guest appearance for the British rockers. In a statement on the group's official website, they say: "In the spirit of trying to do things a bit differently and keep everything fresh, we are going to do a few musical moves that we have not previously attempted."Firstly, in a few weeks we are going to release a version of Lost! which has a guest appearance on it in the form of Jay-Z." Lost! features on Coldplay's latest album Viva La Vida Or Death And All His Friends.

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