FIRST REMEMBRANCE: Alan Jackson stood there alone — no lights, no cameras, no crowds. Just Alan Jackson, a well-worn guitar, and the wind rolling across the Oklahoma plains. On the first anniversary of Toby Keith’s passing, Alan didn’t come as a Country Legend, but as a grieving friend with an unfinished promise. At Toby’s grave, he began to sing the song they had once written together — the song they never had the chance to record.

On the first anniversary of Toby Keith’s passing, Alan Jackson stood alone in the vast...