Speak Now is the most pivotal album in the Taylor Swift discography. It’s not the one that started the story (2006’s self-titled debut) or the one that made her a global superstar (2008’s Fearless), nor is it her biggest album (2014’s 1989) or her straight-up best (2012’s Red). But it was on Speak Now where Swift took full control of her creative enterprise, came into her own as a songwriter, and established many of the key elements that would ground her career for the next decade. It also might be the album that, more than any other, sets the table for the next 10 years of country music, from the pop influences to the confessional style of songwriting. It is, in a word, a landmark.

Swift, unlike many mainstream country stars, was always a songwriter first and foremost. Her debut self-titled record dropped when she was just 16 years old, but she still had writing credits on all 11 songs (and wrote three of them solo, including the number-one country smash “Our Song”). On Fearless, she more than doubled that number, taking solo writing credits on seven of the 13 songs (including “Love Story,” which briefly became the best-selling country single of all time). Still, Swift racked up a lot of co-writes on those first two albums, particularly with veteran Nashville songwriter Liz Rose, who has 12 writing credits across Taylor Swift and Fearless. On Speak Now, the big selling point isn’t that it’s a concept album about wild romance and dramatic heartbreak (Red), or a leap into pop (1989), or a rejoinder to her haters (Reputation), or her “indie” record (folklore). No, the big selling point here is the simple fact that Swift wrote all 14 tracks by herself.