Sticking to their signature sound – tight harmonies and light arrangements –  has worked well for more than 50 years for The Lettermen. Tony Butala, who leads the group with his breathy vocals, was there for their debut in February of 1958 at the Desert Inn Hotel Resort in Las Vegas. Returning to the Ferguson Center by popular demand with their Christmas show, fans will hear favorites “Goin' Out of My Head/Can't Take My Eyes Off You,” “Hurt So Bad,” “Put Your Head On My Shoulder,” as well as traditional holiday tunes. $27 to $57.