Coldplay frontman Chris Martin has said their new album is "more sexy" than the 2005 offering X&Y.Martin was speaking at a press conference in Barcelona where the band were giving a free concert ahead of a US, Europe and Asia tour.Martin joked: "I think we are definitely more handsome than we were three years ago. I think that's reflected in our music, it's much more sexy."Their latest album Viva la Vida or Death And All His Friends stormed the UK album charts but the jury is out as to whether it will crack the notoriously difficult US market.Coldplay's last album sold an estimated 10 million copies worldwide.The band worked with well-known producer Brian Eno on their latest album, after Eno volunteered to collaborate with them, according to drummer Will Champion.Champion said: "We wanted to find someone who had the same effect on us as Brian Eno did on U2 and David Bowie, and Talking Heads, all these incredible bands we love."And so we asked Brian: 'Do you know anyone who could help us in the same way that you did?' And he said: 'Well, I could, I wouldn't mind having a go.'"