Zac and Colton Swon on season 4 of The Voice.

Zac and Colton Swon on season 4 of The Voice.

Zac and Colton Swon on season 4 of The Voice.

Zac and Colton Swon on season 4 of The Voice.

Zac and Colton Swon on season 4 of The Voice.

Zac and Colton Swon on season 4 of The Voice.

Zac and Colton Swon on season 4 of The Voice.

Zac and Colton Swon on season 4 of The Voice.

Zac and Colton Swon on season 4 of The Voice.

The Swon Brothers react to coach Blake Shelton saving them from elimination May 8.

Fans of The Swon Brothers gather in Muskogee at the Oklahoma Music Hall of Fame to watch the duo perform live on The Voice May 7.

Family photo of Zach and Colton Swon.

KJRH

Blake Shelton works with Christian Porter and the Swon Brothers in preparation for their battle round performance.

Christian Porter (L) and the Swon Brothers practice before their battle round performance.

The Swon Brothers perform during the battle rounds of season 4.

Christian Porter (L) waits with host Carson Daly and The Swon Brothers for Blake Shelton's decision on who won their battle round. The Swon Brothers advanced.

Carson Daly consoles Karina Iglesias after she was eliminated after her battle round performance with Judith Hill.

Carson Daly proclaims Judith Hill as the winner of her battle round with Karina Iglesias.

Jess Kellner (L) and Taylor Beckham perform during the battle rounds.

Garrett Gardner and J'Sun perform during the battle rounds. Garrett Gardner advanced for Team Blake. J'Sun was eliminated.

Carson Daly proclaims Holly Tucker as the winner of her battle round performance against Michelle Raitzin.

Amber Carrington and Sasha Allen work with Adam Levine before their battle round performance.

Holly Tucker (L) and Michelle Raitzin perform during the battle round for Team Blake. Michelle Raitzin was eliminated.

Judith Hill (L) and Karina Iglesias perform during the battle round. Judith advanced.

Usher and Pharrell Williams work with Taylor Beckham and Jess Kellner before their battle round.

The Swon Brothers perform during the Blind Auditions of The Voice April 1, 2013.

Coach Adam Levine poses with the members of his team for The Voice season 4.

Blake Shelton poses with members of this team for The Voice Season 4.

Shakira poses with her team members on The Voice Season 4.

Usher poses with his team members for The Voice Season 4.

The Swon Brothers of Muskogee, Oklahoma talk with the coaches after performing during the Blind Auditions of The Voice April 1, 2013.

Adam Levine stands on his chair as contestant Judith Hill performs during the Blind Audition stage of The Voice season 4.

Usher, Shakira, Adam Levine and Blake Shelton perform on stage during season 4 of The Voice.

The Voice coaches all "want" a contestant during season 4 of The Voice.

Shakira, Blake Shelton and Usher perform on stage during season 4 of The Voice.

The Morgan Twins perform for the coaches during episode 1 of season 4 of The Voice.

The Voice coaches behind the scenes of Season 4.

The Voice - Shakira and Usher behind the scenes of season 4.

The Voice coach Usher talks with a reporter.

The Voice - Carson Daly, Usher, Blake Shelton

The Voice host Carson Daly poses on the red carpet for photographers.

The Voice host Carson Daly speaks to a reporter.

The four coaches all want a contestant during the Blind Audition phase of The Voice season 4.

Shakira celebrates getting a contestant during the Blind Audition stage of The Voice in season 4.

Shakira and Usher both turn around and compete for a contestant during the Blind Audition stage of The Voice season 4.

Shakira, Usher and Blake Shelton make their cases for a contestant during the Blind Audition stage of The Voice season 4.

Shakira on set during the Blind Auditions of season 4 of The Voice.

Adam Levine on set during the Blind Auditions of The Voice season 4.

Adam Levine and Shakira during the Blind Audition stage of The Voice season 4.

Shakira and Usher during the Blind Audition stage of The Voice season 4.

Blake Shelton during the Blind Audition stage of The Voice season 4.

Usher during the Blind Audition stage of The Voice season 4.

Usher and Blake Shelton compete for a contestant during the Blind Audition stage of The Voice season 4.

Adam Levin and Blake Shelton during season 4 of The Voice.

Hillary Scott and Adam Levine The Voice season 4

Shakira and Joel Madden The Voice season 4

Pharrell Williams and Usher The Voice season 4

Blake Shelton and Sheryl Crow The Voice season 4

Usher poses during a photo shoot for The Voice season 4

Shakira poses during a photo shoot for The Voice season 4

Blake Shelton poses during a photo shoot for The Voice season 4

Adam Levine poses for during a photo shoot for The Voice season 4.