The Pretenders are experimenting with an innovative way to release their latest album - by giving away a free track every week until the LP hits stores.The veteran rockers are preparing to launch their first new disc in six years, Break Up The Concrete, on 23 September.However, as of 23 July the band are giving fans the chance to download one free track from their official website each week until the album's release.The first free track to be offered for download is called Boots Of Chinese Plastic.