Don't think The Sing-Off will ever air again. Unless NBC revamps it again (3rd time lucky?) or it moves to another network. These networks base everything off of ratings and TSO ratings are dismal. No matter how popular the show is or how many signatures you can get on a petition, ratings will always come first. Everything is about the $$$. Reality singing competition shows are fading, all getting repetitive. Besides a couple of winners, none of the winners have really been that successful. However, if it does air again. Don't want it to air on NBC. Terrible marketing job.