After 2010's entirely self-penned Speak Now, Swift decided to invite some friends along, including Max Martin (on the smash single ''We Are Never Ever Getting Back Together''), Butch Walker, and Ed Sheeran. ''I ended up being inspired by a lot of crazy zero-to-100-then-it-hits-the-wall-and-then-explodes relationships,'' she's said. Gentlemen, prepare to get served. —Kyle Anderson