Chris DuBois, Ashley Gorley and Brad Paisley co-wrote 'Then,' the lead single from Paisley's 2009 album, 'American Saturday Night.' Released in April 2009, the tune hit No. 1 on the Billboard Hot Country Songs chart in June -- Paisley's 10th consecutive No. 1 -- and landed in the Top 20 of the Hot Adult Contemporary Tracks (the singer's first time on that chart) chart later that summer. 'Then' has also been certified platinum. Below, Gorley shares the story of writing the hit with The Boot.