In a nod to the immense and intense pressure that the four remaining finalists are under as the season winds down over the next two days, the four coaches on 'The Voice' opened tonight's episode by singing Queen & David Bowie's classic rock anthem 'Under Pressure.' Even though the coaches come from four very different genres -- country, pop, pop-rock and neo-soul -- they all added their own unique spin and flair to their parts. The coaches saved the competitive edge for their team members and didn't try to overpower or outdo one another for their performance. Classy move, guys.

On paper, this genre mash up might seem like a bad idea, but the execution was stellar. Blake Shelton's country twang lived comfortably next to Adam Levine's higher register pop croon, while Christina Aguilera's soulful, almost bluesy vocals butted up beautifully against Cee Lo Green's flashy wail. We always say that a good, solid song can cross genres and it did just that tonight.

We have to ask, though, what is up with Xtina's hair? The mega-long, crimped extensions looked messy and knotted and just plain too big. It's not her best look. But fierce follicles aside, Aguilera sounded like her usual diva-riffic self.

Watch 'The Voice' Coaches Sing 'Under Pressure'