When You Believe was recorded by The X Factor winner Leon Jackson in December 2007. The single was available to download from midnight after the result of the show on December 15, 2007, and a CD was rush-released mid-week, on December 19, 2007. This is unusual as most new singles are released on a Monday to gain maximum sales for the UK Singles Chart the following Sunday, although the previous two X Factor winners have had their singles released in this fashion, in order for them to compete to be the Christmas number-one single, which they all duly became. A video for the single was made by the final four of the series; Jackson, Rhydian Roberts, Same Difference and Niki Evans. However, only the winner's version of the song and video was released. The song ended 2007 as the year's 4th biggest-selling single in the UK[29] and remained number one into 2008.[30] However, this version of the song only managed to stay in the top 40 for 7 weeks, despite being the fastest selling of 2007. It also soon disappeared from the top 100, and was gone by late February at the earliest