I do, I do, I do, I do, I do… want to sing ABBA on Sunday night. Well be sure to tune into Idol when the remaining contestants belt out their favourite ABBA hit.

With a smorgasbord of singles to choose from including 'Gimme! Gimme! Gimme! (A Man After Midnight)', 'Dancing Queen', 'SOS' and 'Fernando', how will our Idols put their own twist on some of these classic songs?

It is a challenge that will test all of the Idols and will no doubt make some of them very nervous indeed. Will they be wearing white flared jumpsuits? Veteran of these theme nights is host Ricki-Lee Coulter, who will be on hand to soothe the nerves and fire our Idols up.

Joining her are Andrew G and James Mathison who are there to support and encourage the Idols throughout their performances, as well as deliver the devastating news of who will be leaving the competition on Monday night. Voting lines open as soon as the final contestant has performed on the Sunday night, giving Australia an opportunity to vote for their favourite contestant and hopefully keep them in the competition.

On Monday night, the bottom three contestants will be announced, as voted by the Australian public. Those three contestants will be required to perform once again and the voting lines will reopen, giving Australia a second chance to save their favourite Idol. The one contestant with the least cumulative votes, from both Sunday and Monday night, will leave the show, bringing the remaining eight contestants one step closer to become Australian Idol 2008.

7.30pm Sunday October 5 and Monday October 6