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".
Girls Aloud songs inspired by 1980s electropop, while also exploring retro styles. "The Promise" is a 1960s Spector-influenced number, while "Rolling Back the Rivers in Time" was compared to Burt Bacharach. Girls Aloud were one of the few pop acts to achieve continued success and longevity throughout the mid-2000s while R&B and rock music became more popular. In a review for the group's 2008 Tangled Up Tour, David Pollock of "The Independent" noted that "Girls Aloud remain confidently the only pop show in town." "The Times" stated, "Not since Abba and Michael Jackson has pure pop been so unanimously praised." Girls Aloud's