A lot of Taylor Swift's songs might be getting back at somebody for past slights; in her liner notes, she writes, ''To all the boys who thought they would be cool and break my heart, guess what? Here are 14 songs written about you. HA.'' But for Swift, revenge is a dish best served with warmth. There's a playful sweetness even to her saddest and angriest songs — including her next single, ''Picture to Burn,'' a truly gleeful comeuppance anthem (''I hate that stupid old pickup truck you never let me drive/You're a redneck heartbreak who's really bad at lying''). Taylor's career keeps rolling along. She's now had music streamed through her MySpace page more than 40 million times. Her album is at No. 1 on the Billboard Country Albums Chart for the 15th straight week, and her new single, "Picture To Burn," is already in the Top 20.