"Titanium" David Guetta ft. Sia

Is Sia having a moment? After adding a level of emotional resonance to Flo Rida's most recent party hit earlier this year, the Australian singer-songwriter gives another moving performance as the featured vocalist on David Guetta's latest single, "Titanium." Taking a more mature, pensive approach that we've rarely seen from the French DJ, Guetta's production is sparing and subtle, often falling to the background of the track, so that its occasional bursts of pounding synths have maximum impact. But the real highlight is once again Sia, whose rich, soaring vocals make the otherwise vague central metaphor ("I am titanium!") come alive with feeling. The chorus, in particular, is an awesome explosion of pure ecstatic release. B+