Garth Brooks and Trisha Yearwood's holiday special, Garth & Trisha Live! A Holiday Concert Event aired Sunday night on CBS.
Garth teared up during the performance of Belleau Wood.
He co-wrote the song in the 90's about Christmas during the First World War.
The song is emotional and details the tragedy of war and the triumph of the human spirit.
Garth said he normally performs a shortened version of the song but decided to do the full song on Sunday.
He ended up stopping to apologize and wipe away tears.
What song always makes you cry?