in the show's history, this week's live decider featured a bottom three. However, one act was immediately eliminated while the other two faced off in the final showdown before the judges' votes as usual. On 24 October 2015, the performances of two contestants entered the ARIA Singles Chart. Jess & Matt's performance of "Do You Remember" debuted at number 53 and Cyrus Villanueva's performance of "Hold Back the River" debuted at number 100. Week 4 (19/20 October) Theme: Rock Group performance: "Mickey" / "Shake It Off" Celebrity performers: Conrad Sewell ("Who You Lovin") and Adam Lambert ("Another Lonely Night") Judges' vote to eliminate Blunt: In Stereo – complimented In Stereo's final showdown performance but felt it was "too little too late". Isaak: In Stereo – gave no reason, although stated that the final showdown performances were close. Minogue: In Stereo – felt In Stereo were worse that week. Sebastian was not required to vote as there was already a majority and did not say how he would have voted as both acts were in his category. Week 5 (26/27 October) Theme: Trailblazers Group performance: "Whip It!" with LunchMoney Lewis Celebrity performers: LunchMoney Lewis ("Bills"), Peking Duk ("Say My Name") and Nathaniel ("Always Be Yours") Judges' vote to eliminate Sebastian: Michaela Baranov – stated he was fond of Simpson. Isaak: Michaela Baranov – thought Simpson was suited to the show. Minogue: Mahalia Simpson – decided to vote for Simpson in an attempt to give Blunt an opportunity to send the result to deadlock. Blunt: Michaela Baranov – felt Simpson had improved more. Notes On 7 November 2015, the performances of two acts entered the ARIA Singles Chart. Jess & Matt's performance of "Dancing in the Dark" debuted at number 107 and Cyrus Villanueva's performance of "Rumour Has It" debuted at number 109. Week 6 (2/3 November) Theme: Judge's Challenge Group performance: "Fight Song" Celebrity performers: Rachel Platten ("Stand by You"), Hozier ("From Eden") and Aston Merrygold ("Show Me") Judges' vote to eliminate Minogue: Natalie Conway – backed her own act, Mahalia Simpson. Blunt: Mahalia Simpson – backed his own act, Natalie Conway. Isaak: Natalie Conway – felt there was something "unique" about Simpson. Sebastian: Mahalia Simpson – could not decide and sent the result to deadlock. With the acts in the bottom two receiving two votes each, the result was reverted to the earlier public vote for the first time this