UNIVERSAL CITY, Calif., Dec. 17 (UPI) -- Natasha Bedingfield, Bobby McFerrin, Boyz II Men and Smokey Robinson will spice up the finale of "The Sing-Off" in Los Angeles by singing a cappella, NBC said.
Presided over by host Nick Lachey, the live two-hour finale of NBC's singing competition show is to air Monday.
Advertisement