But I digress...
The problem with the well-known choral ensemble formerly known as The Mormon Tabernacle Choir is that they are still in fact Mormon. Their name may have changed, but their theology hasn't.
Mormons (formerly called) do not worship the one true God of the Bible. They worship a different god (a false god: one who is married to a goddess wife with lots of "spirit babies"). They worship a different Jesus (a false christ: the "spirit brother of Lucifer"). They believe in a different gospel (a false gospel: a works-based gospel).
See: Fast Facts on Mormonism (The Church of Jesus Christ of Latter Day Saints) - CMI
Watch: Mormons Have A Different God, Christ, & Gospel Than Christianity - Dr. John Barnett