The song is about the relationship between and father and son over the course of several years.
(Undated) -- Brantley Gilbert says his baby boy, Barrett, will very much be a part of his upcoming album.
The new father tells "People" magazine he wrote a song called "The Man That Hung the Moon" for his six-month-old son.
Gilbert has not yet revealed when his upcoming album will drop.
He's currently on the road for his 2018 The Ones That Like Me Tour.