More than a year after the third cycle of The Sing-Off ended its run on NBC, the network has greenlighted a fourth cycle of the reality competition series for acapella groups hosted by Nick Lachey. Auditions are slated for April 27-May 18. The Sing-Off did solid business for NBC when it aired as a week-long strip in December 2009 and 2010, part of the network’s holiday programming. But when NBC slated it as a two-hour regular weekly series in fall 2011, it fizzled. NBC will likely revert to the show’s original format as a multi-night holiday event for Season 4.
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