Lady Antebellum's "Need You Now" was the first country song to sell 5 million digital copies. It achieved the feat on April 7, 2011. That heartfelt ballad is likely to also become the first country song to sell 6 million digital copies. It is just 139K units away from that threshold. It's currently selling about 9K a week.
Point is, most of Taylor's singles get played on pop stations (aka crossover hits), which usually leads to bigger digital sales. Carrie only gets played on Country (and HAC a bit), which makes her digital sales even more impressive.
