Little Big Town is an American country music vocal group from Homewood, Alabama. Founded in 1998, the group has had the same four members since its founding: Karen Fairchild, Kimberly Schlapman, Phillip Sweet, and Jimi Westbrook. From Wikipedia
Sugarland's planned performance and presentation duties were disrupted as Jennifer Nettles fell ill, with Kristian Bush presenting solo and Little Big Town replacing them on stage.