The Sing-Off premiers on Sept. 19 at 8 p.m. on NBC. Nick Lachey will return as the host, with judges Ben Folds, Sara Bareilles and Shawn Stockman.
Here's a look at this year's Acapella groups competing for a Sony Music recording contract and $100,000.
"This fun-loving ensemble from Howard University started as a class in the music department," according to NBC. "They have plenty of soul, and all nine members meld together with beautiful harmonies, soaring solos, and a fresh look."
The Cat's Pajamas
"The Cat’s Pajamas, the all-male vocal band that formed in 2005, 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," according to NBC. The group has appeared on America's Got Talent and The Next Great American Band.
"Formed by Street Corner Symphony’s Jeremy Lister (The Sing-Off, 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," according to NBC.
"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," according to NBC.
"This all-female a cappella group, which includes members from the first two seasons of the series, has been singing across the country, but still carry an unfulfilled desire to conquer The Sing-Off stage," according to NBC.
"Founded in 1991, The University of Delaware Deltones, pride themselves on their smooth tunes and their motto - friends first, singers second," according to NBC. 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." American Juniors contestant, AJ Melendez, is part of the group.
The Fannin Family
"The Fannin Family’s mother was almost a nun and their father was a rock musician," according to NBC. The outcome was 11 extremely well-behaved musicians and eight of them will be taking the stage to show the nation their Midwestern swag."
"A nine-piece professional vocal group from Los Angeles in which everyone can sing lead, with all members coming from very strong musical backgrounds," according to NBC.
"Originally from Africa, 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," according to NBC.
"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," according to NBC.
"The five-member group has a modern style and draws influences from several eclectic electro genres, including dub step and garage house," according to NBC.
"Formed in 2006 as a recording project that grew into a vocal band, the 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," according to NBC. In the clip below, Sonos is singing back up for Sara Bareilles.
"This award-winning mixed a cappella group from Wilsonville High School is comprised of students from all grade levels, musical backgrounds and vocal types," according to NBC.
"The 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," according to NBC.
"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," according to NBC. "This fun loving group’s mark of distinction is their bright yellow blazers and distinctive sound."