Stone joined Band Aid 20 on 14 November 2004 in benefit of Sudan's troubled Darfur region. The group, consisting of such luminaries as Coldplay lead singer Chris Martin and U2 lead singer Bono, re-recorded the 1984 song "Do They Know It's Christmas?", written by Band Aid organisers Bob Geldof and Midge Ure. Stone, born two years after the release of the original single, was not initially aware of who Bob Geldof was. The media gleefully reported that she repeatedly referred to him as Bob Gandalf. Despite some criticism, the single became the UK's biggest-selling single of 2004 as well as the 2004 Christmas number-one single.