NBC’s The Sing-Off is getting a fourth season, with auditions starting at the end of April. The a capella competition wrapped its last run in November 2011, meaning the show will have been off the air for at least a year and a half if not nearly two years by the time it returns. There’s not yet any word on the judging panel, which last consisted of Ben Folds, Sara Bareilles, and Boyz II Men’s Shawn Stockman, with Nick Lachey as host.