Gwen Stefani chats with ET’s Cassie DiLaura ahead of the battle rounds on season 24 of ‘The Voice.’ The singer reflects on the void her husband, Blake Shelton, has left since he departed the show last season. ‘The Voice’ airs on Mondays at 8 p.m. PT/ET and on Tuesdays at 9 p.m. PT/ET on NBC.