My quick thoughts prior to caraway_ 's more erudite and lucid posting on same.
Anthony - agree with Dicko, had it last week, lost it again - has to take the opportunity to show something different.
Chanel - oh dear, my darling what did you do, why that song, why, oh why?
Dan - pretty boy will go throught regardless of lacklustre performance.
Courtney - Billy Field!! - what a great choice, covered the bungle well, and finished it. One of the best voices there.
Amali & Ricki-Lee - disco divas gone wrong, terrible, terrible, terrible songs.
Marty - Farnsy & Barnesy - what were you thinking, lost me last night.
Emelia - good luck with your future efforts, but possibly not on Idol.
Daniel - good execution, but didn't do it for me - nice hair though.
Angie - what happened!!
Hayley - well colour me impressed, Ella Hooper has such a distinctive style, that I didn't think anyone would try to replicate it. Hayley did, and with style.
Casey - outstanding, great song choice and so well done, emotionally the best performance of the night.
So our 2 votes went to Hayley and Casey. Song choices really are playing an important role in this series, even the best performer can give a dud performance with a dodgy song choice. Dicko continues to be the most honest of the judges.