During the 2010s, few country-pop groups were as big on either the country or pop side of things as Little Big Town. The band's reliance on sumptuous four-part harmonies and interwoven lead vocals -- Karen Fairchild, Kimberly Schlapman, Phillip Sweet, and Jimi Westbrook alternated in the spotlight throughout their career -- helped evoke memories of Fleetwood Mac, a comparison the group would lean into once they began racking up hits on the country charts starting with 2010's "Little White Church." That was a downhome raver, but it was the breezy 2012 number one "Pontoon" that ...