The song was written by Brad Rempel of High Valley with Jim Beavers and Lindsay Rimes.

[3] Nanci Dagg of Canadian Beats Media said that "the melody is upbeat and the brothers’ harmonies soar once again," describing the song as "a tune that will grab you then stick in your head from the moment you listen to it".

[4] Lauren Laffer of Sounds Like Nashville called the track "nostalgic," saying it "speaks to the essence of remembering where you came from and embracing the memories that will last a lifetime".

[3] "Those Were the Nights" reached a peak of number nine on the Billboard Canada Country chart dated July 21, 2018,[6] marking the group's second consecutive and second overall top ten hit.

[8] The official music video was for "Those Were the Nights" premiered exclusively on Sounds Like Nashville on May 4, 2018,[9] and was directed by Gavin Michael Booth.