The Vegas debut of Garth Brooks, the crowning of CMA Entertainer of the Year Taylor Swift, the breakup of Brooks & Dunn and the engagement of Carrie Underwood are among the top stories of 2009. But the soundtrack to these milestones is led by Jason Aldean’s “She’s Country,” which was the most-heard song of the year at radio, according to Mediabase. “I felt like it was something really cool when I first heard it,” Aldean told us at his No. 1 party for the song. “Now, did I know that it would be a four-week No. 1? No. But I felt like it was a really cool song that if radio played it, it had a good shot at something really special happening with it.” Zac Brown Band’s “Whatever It Is,” Darius Rucker’s “It Won’t Be Like This For Long,” Keith Urban’s “Sweet Thing” and Toby Keith’s “God Love Her” round out the top five. Speaking of Urban, he is 2009’s most-heard artist and Top Male artist at radio with his hits “Sweet Thing,” “Only You Can Love Me This Way,” “Kiss A Girl” and “Start A Band” (with Brad Paisley). According to trade publication Country Aircheck, Urban broke Kenny Chesney’s three-year run atop both lists. The Top Female Performer was Taylor Swift, Top Duo/Group was Zac Brown Band and Top New Artist went to “Boots On” singer Randy Houser.