'The Sing-Off' Finale: Pat Benatar, Pentatonix, 98 Degrees to Perform

Neil Giraldo will join Benatar onstage, as show judges Jewel, Shawn Stockman and Ben Folds each perform with the a cappella competition finalists. Grab your pitch pipes -- The Sing-Off has announced the lineup for its two-hour finale on Monday night. Special guests Pat Benatar and Neil Giraldo will sing their 1984 hit duet  “We Belong," and season three winners Pentatonix will also return to the stage they conquered in 2011. PHOTOS: 'The Sing-Off:' Meet the Season 4 Singers Additionally,...