Girls Aloud by Louis Walsh until 2005 when Hilary Shaw replaced him. The new group competed with the boys' winning group, One True Voice to have 2002's Christmas number one single. Girls Aloud won the battle with their single "Sound of the Underground", produced by Brian Higgins and Xenomania. The song spent four consecutive weeks at number one and was certified platinum in March 2003. The song received critical acclaim; Alexis Petridis of "The Guardian" stated that "it proved a first: it was a reality pop record that didn't make you want to do physical harm to everyone involved in its manufacture".
Chemistry (Girls Aloud album) "Long Hot Summer", released in August 2005 as a "buzz" track to regenerate interest in the girls. The song was earmarked for release on the soundtrack of the 2005 film "". The plans fell through, but the music video had taken inspiration from the movie's car theme and Girls Aloud portrayed mechanics. The song wasn't as well received by critics, and it became their first single to miss the top five. The follow-up "Biology" was critically acclaimed and saw Girls Aloud return to the top five. Peter Cashmore, writing for "The Guardian", described "Biology" as "the best pop single of