They're the fifth highest selling act of all time and tonight our Australian Idols are performing tributes to Abba.

Chrislyn Hamilton

Mamma Mia

This is the first week I haven't really liked what Chrislyn has done. I don't think this was the best song choice for Chrislyn but at least she looked like she was having fun.

Sophie Paterson
Gimme Gimme Gimme (A Man After Midnight)
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Oh look. Sophie Paterson has killed another great song. What a surprise.

Thanh Bui
The Winner Takes It All
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Thanh is great this week. Performing at a piano and singing like a professional he is completely in the zone and is full of emotion delivers a truly stunning performance.

Roshani Priddis
Money Money Money
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You can't really fault Roshani's consistency on Australian Idol.

Wes Carr
Fernando
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I'm not sure I'm enjoying tonight's show. Where has all the pop sensibility gone? I'll give them props for mixing things up though.

Mark Spano
Waterloo
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It's great to see Mark bring some indigenous aspects to Australian Idol as he goes walk-about every time he performs. It's a little distracting from his actual performance.

Madam Parker
Dancing Queen
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Madam is a little pitchy tonight. I think Dicko is right in thinking everyone is spooked by Abba tonight.

Teale Jakubenko
Thank You For The Music
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This isn't really Teale's best performance tonight. Nice to see him playing his guitar but it was a little bland.

Luke Dickens
Knowing Me, Knowing You
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I thought Luke did relatively well considering Abba really wasn't his thing. I bet he's looking forward to a genre that he's more suited it.

My bottom three for tonight would be Chrislyn Hamilton, Madam Parker and Sophie Paterson. I doubt it will be any of them who leave though.