"Sound of the Underground" is a song that was the debut single of British-Irish pop group Girls Aloud, and later featured on their debut album of the same title. The song was written by Miranda Cooper, Brian Higgins and Niara Scarlett, and produced by Higgins and his production team Xenomania. Following Girls Aloud's formation on the ITV1 reality television show Popstars: The Rivals, "Sound of the Underground" was released 16 days later, on 16 December 2002. Commercially, it was an immediate success; it became the year's Christmas number one in the UK, spending four consecutive weeks atop the chart. It also reached number one in Ireland and peaked within the top forty in Australia, Belgium, the Netherlands, Sweden and Switzerland.

Michael Louis Vincent Walsh is an Irish music manager and television personality. He has managed Johnny Logan, Boyzone, Jedward and Westlife, four of Ireland's most successful pop acts in the 1990s and 2000s. He has also served as a judge on television talent competition shows, including Popstars (2001–2002), You're a Star (2003–2004), The X Factor, and Ireland's Got Talent (2018–2019). In 2024, Walsh was a contestant on the twenty-third series of the reality show Celebrity Big Brother.