Three words: Men in kilts. If that’s not reason enough to see Celtic Thunder perform, then the vocal prowess of its six members should be. Since forming in 2007, the ever-evolving ensemble has attracted a fervent fan base and sold more than two million albums. While the lineup has changed over the years, the talent has been consistent. Backed by the Celtic Concert Orchestra, the group draws from a vast repertoire of Irish folk tunes, hymns and pop ballads. The darlings of the Emerald Isle perform solo and ensemble numbers as part of the Very Best of Celtic Thunder Tour.