Intergalactic Song Contest

The Intergalactic Song Contest, originally called the Eurovision Song Contest (up until the formation of the United Earth and the Earth Empire), was an annual international song competition, with participants representing different worlds. Each participating world submits an original song to be performed live, then casts votes for the other worlds' songs to determine the winner.

The Doctor and Erin Stevenson attended the 3256 contest, in which Sontar won with their song 'My Last Battlefield'. The human contestant was under the influence of the Carrionites, with the intention to unleash them with her song 'The Food of Love'. (DW: The Food of Love)

Behind the Scenes
The contest is based upon the real life Eurovision Song Contest, which in universe said to be an early version of the Intergalactic Song Contest.

Coexistence with Eurovision
Commonly, when Doctor Who (or one of it's spin offs) aired on the same night as Eurovision, which happened on several occasions, the episodes were moved earlier on the schedule and directly proceeded Eurovision.
 * Revenge of the Master Part Four aired on the same night as Eurovision Song Contest 1996.
 * The Web of Time Part Four aired on the same night as Eurovison Song Contest 1998, which was hosted by the BBC. The Doctor Who finale and Eurovison was publicised as a "British Night".
 * The Most Questionable Decision in the Universe Part Two aired on the same night as Eurovision Song Contest 2000.
 * One Thousand, Nine Hundred and Two Part Two aired on the same night as Eurovision Song Contest 2001.
 * The Sands of Life Part Three aired on the same night as Eurovision Song Contest 2003.
 * Test of Nerve aired on the same night as Eurovision Song Contest 2005.
 * Maybe It's Imaginary aired on the same night as Eurovision Song Contest 2010, the episode coincidentally followed a similar theme to Eurovision 2010, which the BBC publicised upon.
 * Useful Occupations and Deceptions aired on the same night as Eurovision Song Contest 2012.
 * Ascension, in the UK, aired on the same night as Eurovision Song Contest 2013.
 * Doctor Who itself crossed over with Eurovision, when the Fourteenth Doctor and Erin Stevenson appeared live on stage during Eurovision Song Contest 2015.