British music group Coldplay's Chris Martin performs during his concert in Hong Kong Thursday, July 13, 2006. Coldplay frontman Chris Martin said the band doesn't want to impose their political beliefs on others, but that band members feel an obligation to use their celebrity for a good cause. "We don't want to be preachy, we just say those words (fair trade), and make sure people look it up themselves," Martin said at a press conference in Hong Kong ahead of a Coldplay concert Thursday.