text:  So really, Sasha, we'll just have to wait and see how the NATO summit goes. That's NPR's Ashley Westerman in Lviv. Thank you. Thank you. The number one song on Billboard's pop chart is the same as the number one song on Billboard's country chart. And the identity of the artist signals a change in country music. NPR's Anastasia Tsiokas has more. The Virginia-based artist Shabuzy has had a long, slow climb to the top.