Every year the Choo Choo Chorus —a choir of more than 100 men and women—get together to sing sacred and secular Christmas songs in a concert to benefit The Walter E. Boehm Birth Defects Center. The members of the chorus also perform throughout the year mostly in quartets. The Rock City 4 is one. They stopped by to talk to Richard Winham about the upcoming concert and to sing some of the songs they’ll be singing with the chorus on Saturday night.