April 2008 World Report Segment In December the world-renowned King's Singers performed with the Mormon Tabernacle Choir in the annual Christmas concert. This event marked the fourth collaboration between the two groups. The first was in 2002 for the Winter Olympics. For the Christmas concert, current interim director of the Mormon Tabernacle Choir, Mack Wilberg, produced special seasonal arrangements to the delight of the six vocalists from England.