Vince Gill and wife Amy Grant will headline the third annual concert to benefit the Nashville-based Terra's Angels Charities. The charity is an organization of volunteers who assist families who have children with life-threatening cancer. The organization is named for Terra Murrell, who spent nine years battling cancer before her death in 2001. Linda Davis, the Clarks and Little Big Town will also appear with Gill during the Jan. 18 event at the Wildhorse Saloon in downtown Nashville.