VIDEO: Highlights From Last Night's 4-Chair Challenge on THE X FACTOR

"The X Factor" was back with another roound last night, and for the first time, tried out the "Four-Chair Challenge." Ten singers performed for each group, all vying for the alotted four seats. From there, the judges could swap people in and out as they saw fit. Check out some of the night's performances below!

The X Factor made its way to the U.S. In its first season, millions tuned in on Wednesday and Thursday nights (8/7C on FOX) to see stars born, drama unfold, and talent unleashed.

Since its debut in 2004, The X Factor has remained the U.K.'s #1 program for the last seven years, peaking with an audience of 21 million for its 2010 finale. The format swiftly broke similar records around the world, where local versions have consistently rated #1. The series has received numerous honors worldwide, and more than 100 million records have been sold by artists launched through the series, including over 90 #1 singles and albums and 150 Top Ten records.

In a departure from other singing competition series, the first time contestants audition for The X Factor judges they will do so in front of an audience of thousands - raising the stakes and increasing the pressure to impress not only the judges, but also a potential legion of fans. This will be the ultimate test to prove they have the vocal ability, charisma and stage presence that it takes to win an unprecedented $5 million recording contract with Syco/Sony Music.