When Sia isn’t busy scribbling all over her face like an autistic aunt, she’s busy losing sight of how brilliant she really is and pumping out mediocre albums. Thank god, then, for greatest hits compilations: get rid of the detritus, put down the crayons, and give us the highlights. Bring Night, Buttons and pop perfection The Girl You Lost To Cocaine are all here, sparkling like supernovas. Add recent chart-topping anthem Titanium, courtesy of David Guetta, and you have a full house. Finally, a Sia album you can listen to in its entirety without getting annoyed with mediocre filler tracks.