Vying for victory are Canadian alternative country singer Martha Wainwright, Oz Idol contender Rob Mills, lovable lunatic Ross Noble, and just plain adorable Hamish Blake.In tonight's contest Martha and Ross lock horns and prove opposites don't necessarily attract, while Millsy dishes the dirt and comes clean about Paris Hilton.The teams wrestle with more silly scenarios in One Out of Three Ain't Bad, the Wainwright musical lineage is apparent when Martha sings in Substitute, and Millsy's closing tuneful tribute is a trip.