Judges Pete Waterman, Dr Fox and Simon Cowell were hard on nearly all the contestants, saying they struggled to sing the Abba songs they had chosen.
That's because Abba songs were written for and sung by four people, two ladies and two men, so for one person to sing them is very hard.
Only five 'Idols' left now
Rosie seemed to struggle the most, and got the least of the two million votes cast by the public after the show.
Gareth Gates, Zoe Birkett, Hayley Evetts, William Young and Darius Danesh are the five hopefuls still in with a chance of winning.