“Sing-Off” is a televised singing competition that features a cappella groups from various backgrounds. Contestants perform popular songs without instrumental accompaniment, showcasing their vocal harmonies and arrangements. The show emphasizes creativity, teamwork, and vocal talent, with groups competing for a cash prize and the title of best a cappella group. The competition is judged by a panel of music industry professionals, who provide feedback and critiques after each performance. Ben Folds, Shawn Stockman, and Nicole Scherzinger have served as judges on the show, helping to guide contestants through the challenges of the competition.