Mallory Kate Hall and her sister always sing Lady Antebellum's "Compass" to get them through hard times. There have been several of those times lately, as Mallory was in desperate need of a heart transplant.
On Saturday, the Forsyth County girls got the chance of a lifetime to perform the song onstage with Lady Antebellum.
Hunter Hayes joined them on the guitar.
The emotional moment overjoyed the band and crowd alike.
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