The self-reflective single became the duo's eighth No. 1 on Country Airplay.

Tyler Hubbard and Brian Kelley of Florida Georgia Line pose in the press room at the 2016 American Music Awards at Microsoft Theater on Nov. 20, 2016, in Los Angeles. Jason LaVeris/FilmMagic

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Florida Georgia Line established its reputation around a party vibe, but with its single “Confession,” the duo embraced a more serious tone featuring a protagonist who takes his truck to the outskirts of town, pops a cold one and considers his life.

It may have been a step away from the original identity of the act — Tyler Hubbard and Brian Kelley — but it clearly connected with the general public. “Confession” climbed to No.…