The Tabernacle Choir and Orchestra perform “Still, Still, Still,” a 19th-century Austrian Christmas carol on the Nativity, set to a Salzburg folk tune. With new lyrics by David Warner, a longtime friend and collaborator of Mack Wilberg’s, this arrangement of “Still, Still, Still” sees beyond the smiles and sighs of the baby asleep in Mary’s arms to the wonder and promise of Christ, the Savior.