"Do They Know It's Christmas?" is a song written in 1984 by Bob Geldof and Midge Ure in reaction to television reports of the 1983–85 famine in Ethiopia. It was first recorded in a single day on 25 November 1984 by Band Aid, a supergroupput together by Geldof and Ure and consisting mainly of the biggest British and Irish musical acts at the time. The single was released in the United Kingdom on 3 December 1984 and aided by considerable publicity it entered the UK Singles Chart at number one and stayed there for five weeks, becoming the Christmas number one of 1984. The record became the fastest selling single in UK chart history, selling a million copies in the first week alone and passing three million sales on the last day of 1984, on the way to becoming the biggest selling single of all time in the UK. It held this title until 1997 when it was overtaken by Elton John's "Candle in the Wind 1997", released in tribute to Princess Diana following her death. The original version of "Do They Know It's Christmas?" has sold 3.75 million copies in the UK to date.
"Do They Know It's Christmas?" was re-recorded three times in 1989, 2004, and 2014. All the re-recordings were also charity records; the 1989 and 2004 versions also provide money for famine relief, while the 2014 version was used to raise funds for the ongoing Ebola crisis in West Africa. All three of these versions also reached number one in the UK, and the 2004 version of the song was also a UK million seller, with 1.17 million copies sold.