The pair previously performed Lennon's song during Rosalynn Carter's funeral in 2023.
Users across X panned Brooks' performance and noted the lyrics of "Imagine" felt inappropriate to be sung in a church.
"'Imagine,' the song Garth Brooks sang at Carter’s funeral, Is an atheist song. Sung in a high episcopal church, for a Baptist President," one user wrote.
"What a weird song to choose," another user wrote.
Typically, the song is perceived as peaceful. However, the lyrics tell a different story, appearing to in fact be an atheistic, worldly song.
"Imagine there's no heaven / It's easy if you try / No hell below us / Above us only sky," Lennon's song begins before declaring: "Imagine all the people living for today."
The song goes on to take a globalist totalitarian tone as Lennon suggests: "Imagine there's no countries / It isn't hard to do."
"Nothing to kill or die for / And no religion too / Imagine all the people / Living life in peace," the song continues.
Further, the song takes a seemingly communist approach proposing: "Imagine no possessions / I wonder if you can."
"No need for greed or hunger / A brotherhood of man / Imagine all the people / Sharing all the world," Lennon sings.