Sing It On

In the second-season opener, a team search for a beatboxer to replace the one they lost to rivals; and two competing teams have a karaoke battle to size each other up before the season officially begins.

Choreography proves difficult for a team in Philadelphia; the search for a beatboxer continues in Massachusetts; one team deal with new recruits who possess bad attitudes.

One team head to the spa prior to a competition, while their rivals try to repair new wounds; alumni arrive in Philadelphia to help their old group, who are working with a Broadway star; the Maryland crew make a challenging decision.

Two singers plot to bring peace to rival groups; alums share bizarre wisdom with a team; perfectionists wrestle with an unforeseen flaw in their set.

Sound check doesn't go well for one group, and it shakes their confidence; a sneaky set change leads to a confrontation between two team members.

The semifinals are held in Philadelphia; a singer performs a solo in memory of her mother and strives to not get too emotional; two teammates butt heads over how to lead their group.

While preparing for semifinals, Craig makes some dramatic changes to the Hexachords' set and not everyone is happy about it; the members of Sharp Attitude head out of town for a much needed girls' weekend.

The top 10 a cappella groups from the United States and the United Kingdom face off at the Beacon Theatre in New York City.