The Sing-Off

1. Pilot

Air Date: 2009-12-14

Eight a cappella groups from across America compete to win a recording contract; host Nick Lachey.

2. Big Hits & Guilty Pleasures

Air Date: 2009-12-15

Two groups leave as the competition heats up.

3. Superstar Medley, Judges' Challenge & Songs Of Hope

Air Date: 2009-12-16

4. The Finale

Air Date: 2009-12-21

Finale

1. Episode 1

Air Date: 2010-12-06

2. Episode 2

Air Date: 2010-12-08

3. Episode 3

Air Date: 2010-12-13

4. Episode 4

Air Date: 2010-12-15

The five remaining groups come together for a performance; each group sings a medley of songs by a single artist; the judges choose the contestants' next assignment.

5. Episode 5

Air Date: 2010-12-20

1. Season Premiere: Part 1

Air Date: 2011-09-19

Eight of the 16 competing acapella groups perform as the competition kicks off. Sara Bareilles joins Ben Folds and Shawn Stockman on the judging panel.

2. Season Premiere: Part 2

Air Date: 2011-09-26

Eight more groups perform together and separately. The groups include Messiah's Men, North Shore, Pentatonix, Sonos, Soul'd Out, The Collective, University of Delaware Deltones, Vocal Point

3. Radio Hits & 60's Classics: Part I

Air Date: 2011-10-03

Theme: Radio Hits (first round), 60's Classics (second round) Group performance: "Somewhere Only We Know" by Keane

4. Radio Hits & 60's Classics: Part 2

Air Date: 2011-10-10

Theme: Radio Hits (first round), 60's Classics (second round) Group performance: "Rhythm of Love" by Plain White T's

5. Top 10 Groups: Guilty Pleasure Music

Air Date: 2011-10-17

Theme: Guilty pleasures Group performance: "All Night Long (All Night)" by Lionel Richie*

6. Top 8 Groups: Hip-Hop Hits

Air Date: 2011-10-24

Group performance: "Nothin' on You" by B.o.B. featuring Bruno Mars

7. Top 7 Groups: Superstar Medleys

Air Date: 2011-10-31

Group performance: Halloween medley of "This Is Halloween" by Danny Elfman, "Werewolves of London" by Warren Zevon and "Ghostbusters" by Ray Parker, Jr.

8. Top 6 Groups: Rocking Out & Goin' Country

Air Date: 2011-11-07

Theme: Rock classics (first round), Country hits (second round) Group performance: "Wake Up" by Arcade Fire

9. Top 5 Groups: The Rhythm & Blues Revue

Air Date: 2011-11-14

The top five groups open the show with a medley of "I Feel Good" by James Brown, "ABC" by The Jackson 5 and "Crazy in Love" by Beyonce. Later they each perform their favorite R&B hits in an attempt to woo the judges for their votes. The group that remains standing at the end of the season receives the prize of $200,000 cash and a Sony Music recording contract. Nick Lachey hosts and Sara Bareilles, Ben Folds and Shawn Stockman serve as judges.

10. America Votes: Group Mastermixes

Air Date: 2011-11-21

Theme: Master Mix (combining 2 songs from different artists) (first round), Judges' Choice (second round) Group performance: Master Mix: "Bitter Sweet Symphony" by The Verve, "Hollaback Girl" by Gwen Stefani, "Baba O'Riley" by The Who, and "Last Friday Night (T.G.I.F.)" by Katy Perry

11. Live Finale: Top 3 Finalists

Air Date: 2011-11-28

The final three groups perform for the last time before finding out who America voted as the country’s best a capella group.

1. The Sing Off Is Back!

Air Date: 2013-12-09

The groups try to make a good first impression on the judges.

2. Party Anthems

Air Date: 2013-12-11

The nine remaining groups perform party anthems.

3. #1 Hits

Air Date: 2013-12-12

Eight groups perform their favorite hit.

4. My Generation

Air Date: 2013-12-16

The groups perform songs they hope will please all generations.

5. Movie Night

Air Date: 2013-12-18

The groups perform songs from movies.

6. Judges' Choice

Air Date: 2013-12-19

The groups perform songs chose by the judges.

7. Finale

Air Date: 2013-12-23

The three remaining groups compete; one group is declared the winner.

1. One Night Only: A Special Holiday Event

Air Date: 2014-12-17

A cappella groups Timothy's Gift, Melodres, the Exchange, Traces, San Fran 6 and A.Squared compete for a first-place prize of $50,000. Jewel and Shawn Stockman return as judges, and are joined by Fall Out Boy's Patrick Stump.