For a few nights each December, The Church of Jesus Christ of Latter-day Saints’ Conference Center stops feeling like a venue and starts feeling like a shared “heartbeat,” as Stephanie J. Block put it — 21,000 people gathered in the dark, letting music do what language can’t.

This year’s Tabernacle Choir Christmas concert, Dec. 11–13 at 8 p.m., leans into that hush-and-wonder space, pairing familiar carols and the Nativity with a cosmic storyline that keeps widening the lens: the “ Earthrise ” moment, the overview effect, the shock of seeing home as something fragile and bright.

And for the first time, the featured guest artists are a married couple — Block, a Tony Award winner, and Sebastian Arcelus, a Broadway and TV actor — bringing an onstage intimacy that, somehow, makes the room

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