The X Factor is a British television music competition to find new singing talent. The fifth series was broadcast on ITV from 16 August 2008 until 13 December 2008. It was won by Alexandra Burke, with new judge Cheryl Cole emerging as the winning mentor. Auditions in front of producers were held in April/May, with callbacks in front of the judges in June. The number of applicants for series 5 reached an all-time high with a reported 182,000 people auditioning. A number of well-established music acts from around the world, such as Mariah Carey, Britney Spears, Miley Cyrus, Girls Aloud, Take That, Il Divo, and series 3 winner Leona Lewis performed during the live stages of the show. Burke's prize, as winner, was a £1 million recording contract with Syco Music. Her debut single, "Hallelujah", written by Leonard Cohen, was released for digital download at 00:01 on 14 December 2008, with the physical format following on 17 December. It was later announced that her single had become the fastest selling song of all time.