Sarah Harding participating in weekly Saturday night live performances (alternating weekly between the girls and boys). Each week the contestant polling the fewest phone votes was eliminated, until the final line-ups of the groups emerged. Harding joined Nadine Coyle, Cheryl Tweedy, Nicola Roberts, and Kimberley Walsh to comprise the new girl group Girls Aloud, formed through the show by a public vote on 30 November 2002. The group's debut single "Sound of the Underground" peaked at number one on the UK Singles Chart, becoming the 2002 Christmas number one. Girls Aloud hold the record for the shortest time between formation and reaching
Chemistry (Girls Aloud album) on 2 December 2005 and in the United Kingdom on the following Monday. In addition to the standard edition of the album, a limited edition with a bonus disc was also released. The bonus disc contains Christmas music, including covers and original songs produced by Xenomania under the moniker Festiv Gifts. The songwriters also took on Christmas-related pseudonyms. In Australia and New Zealand, the album was released on 20 February 2006; however, it failed to generate much interest. Additionally, "Chemistry" and other Girls Aloud releases appeared on the US iTunes Store on 26 June 2007. The album's first single was