ET got a behind-the-scenes look at all the madness that takes place off-camera to make sure the show-stopping performances on The Voice go off without a hitch.

"The production team on The Voice is really crazy," Pharrell Williams told ET. "They put things up and take them apart as if it is Formula One."

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"It's pretty incredible how they do it," Williams' fellow coach, Adam Levine, added. "It's so impressive. It's kind of down to a science."

Music lovers are used to seeing concerts with many different elements, but with several mini concerts taking place within a single two-hour episode, The Voice pushes its crew further than any regular stage show.

"With television it's a little bit different," said performance producer Jeri Slaughter. "The turnaround time is crazy. It's fun at the same time, because it kind of keeps you on your toes."

A team of 70 stagehands have about three and a half minutes to switch out one huge group of set pieces for another. Those elaborate set pieces include smoke machines, fire-spitting pipes, and flashing light towers.

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Slaughter produces the performances for Christina Aguilera's team, and he dished on working with the pop diva.

"With Christina, she definitely likes to go all the way out there. She loves the high glam, the drama," Slaughter shared.

"I just try to make them shine in whatever capacity I feel is right for them as artists," Aguilera told ET.

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Watch the video to see the army of production workers do their magic in between commercial breaks, while the contestants prepare for the opportunity of their lives. The Voice airs Monday and Tuesday nights at 8 p.m. ET/PT on NBC.