Overview: Joining Marvin and Rochelle are Atomic Kitten stars Liz McClarnon and Natasha Hamilton, Blue’s Simon Webbe and Duncan James, and Steps members Claire Richards and Lee Latchford-Evans. They may have had a string of number one hits between them, but whose music knowledge is good enough to get them through to the final chart rundown and the chance to win £10,000 for their chosen charity?