A countdown of the King's 20 greatest hits, from Heartbreak Hotel to Hound Dog, It's Now or Never to Jailhouse Rock, as voted for by the British public. The programme, narrated by Zoe Ball, features archive footage and home movies, and contributions by different generations of stars who have been influenced by him, including Michael Buble, Cliff Richard, Cerys Matthews and Engelbert Humperdinck. There's also an interview with Elvis's ex-wife Priscilla Presley and stories from a host of songwriters, backing singers and musicians who worked with him