13. "Our Song" (2006)
The hit that made me a Swift fan, the first moment I heard it in 2007 – it knocked me sideways in the middle of lunch. (The CW played it as interstitial music between afternoon reruns of the Clueless sitcom and What I Like About You.) "Our song is a slamming screen door," what a genius hook. I Googled to see who wrote this; it turned out the songwriter was also the singer and – how strange – she was just starting out. I hoped she might have at least another great tune or two in her. This song and that voice have kept slamming those screen doors ever since.
Best line: "We're on the phone, and you talk reeeeeal slow/'Cause it's late and your mama don't know."