The Sing-Off 16 Revealed: Who's Back For More?

Kinfolk 9

A nine-piece professional vocal group from Los Angeles in which everyone can sing lead, with all members coming from very strong musical backgrounds. ( Twitter: @Kinfolk9 )

Vocal Point

The all-male group is Brigham Young University's premiere contemporary a cappella ensemble. Their nine-man vocal firepower continually invigorates audiences and entertains fans with inventive arrangements, humor and remarkable vocal percussion. ( Twitter: @BYUVocalPoint )

The Yellow Jackets

Formed in 1956, the University of Rochester YellowJackets are anything but old-fashioned and half the members are enrolled in The Eastman School of Music at the university. This fun loving group's mark of distinction is their bright yellow blazers and distinctive sound. ( Twitter: @URYellowJackets )

Delilah

This all-female a cappella group, which includes members from the first two seasons of the NBC series, has been singing across the country, but still carry an unfulfilled desire to conquer the Sing-Off stage. ( Twitter: @SingDelilah )

Afro-Blue

This fun-loving ensemble from Washington, D.C.'s Howard University started as a class in the music department. They have plenty of soul, and all nine members meld together with beautiful harmonies, soaring solos, and a fresh look. ( Twitter: @AfroBlueDC )

Urban Method

The Denver, Colo.-based group, which includes a rapper, was formed by eight musicians whose individual sounds gravitate toward urban music. Each has extensive studio session work but has never previously performed together. ( Twitter: @Urban Method )

North Shore

For the last 30 years, this refined street corner group has entertained thousands of listeners throughout the Boston area with an experienced blend of harmony, rhythm, and tempo in songs from the 1940s to today. ( Twitter: @NorthShoreGuys )

Dartmouth Aires

Dartmouth College's oldest a cappella group is currently made up of 14 fun-loving, high-energy guys with eclectic tastes and no shortage of quirky antics. (Twitter:
@DartmouthAires )

Pentatonix

Based out of Arlington, Texas, this five-member group has a modern style and draws influences from several eclectic electro genres, including dub step and garage house. ( Twitter: @PTXOfficial )

The Cat's Pajamas

From Branson, Mo. and formed in 2005, this all-male vocal band pride themselves on their ability to engage each audience member during their dynamic, energetic and interactive performances, bringing a blend of classic songs with a modern a cappella twist.

The Collective

Formed by Street Corner Symphony's Jeremy Lister (from The Sing-Off's Season 2), this Nashville-based first-time a cappella group is made up of individual singer-songwriters who came together to demonstrate that there is strength in numbers. ( Twitter: @TheCollectiveTN )

The Deltones

Founded in 1991, The University of Delaware Deltones pride themselves on their smooth tunes and their motto – "friends first, singers second." They focus their energy towards singing on campus and in the Delaware community, as it is important for them to give back to those who support them. ( Twitter: @ilovedeltones )

Fannin Family

Based out of Hortonville, Wisc., the Fannin Family's mother was almost a nun and their father was a rock musician. The outcome was 11 extremely well-behaved musicians and eight of them will be taking the stage to show the nation their Midwestern swag. ( Twitter: @FanninEleven )

Messiah's Men

Originally from Africa (and now based out of Minneapolis, Minn.), these unofficial brothers survived the war in Liberia through the power of song and are on a mission to sing their hearts out while serving the Lord.

Sonos

Formed in 2006 as a recording project that grew into a vocal band, this L.A. group blends their voices together in perfect harmony through years of experience. The live electronic effects they are also known for will not be part of the competition. ( Twitter: @SonoSings )

Soul'd Out

This award-winning mixed a cappella group from Wilsonville High School (in Oregon) is comprised of students from all grade levels, musical backgrounds and vocal types.

Nick Lachey will once again host The Sing-Off when Season 3 premieres Monday, Sept. 19, at 8/7c. This year's celebrity judges are Sara Bareilles, Ben Folds and Shawn Stockman.