NASHVILLE, Tenn (Reuters) - Carrie Underwood says she's glad she took some time off from country music following her marriage to hockey star Mike Fisher in 2010. After storming the country music scene since her 2005 "American Idol" win, her almost two-year break from recording and touring helped her find "real things to sing about", and write what she calls her fun, rocking new single "Good Girl." "I feel like so many people get stuck. They write, they get songs together, they make an album, they go on tour. Then they do it all over again. I just wanted to change things up. ...