You may find this hard to believe about country’s reigning diva next door — the one who made a first impression by way of American Idol and “Jesus Take the Wheel” — but Carrie Underwood has put out an album that gets off to a far more daring start than any other mainstream country offering this year. First comes “Good Girl,” the latest (and most pop-rock-propelled) in her line of sassy takedowns of not-to-be-trusted guys. Then there’s the title track of Blown Away, a story-song about a traumatized young woman willing a tornado to pulverize her boozing, abusing dad. Underwood herself plays the girl in the video, visually identifying with the desperate and empowering qualities of the victim’s revenge fantasy. Right about now, that song sits in an otherwise feel-good and sentimental country Top 10. The third track on the album is her high-gloss, arena-scale murder ballad “Two Black Cadillacs,” in which a wife and a mistress conspire against a two-timing man. Add to that the fact that Underwood’s interview with The Independent let the world know there might just be such a thing as a country superstar who supports same-sex marriage, and you’ve got a performer who’s contributing a lot to her genre, including megawatt power balladry.