Song at CVS

Heard a song at CVS around 12:30pm EST. It was a female singer and the words were a little muffled, but the last minute or so was her repeating the same line, and after a couple of them she would say "I wanna know."

interesting.. who is it?

I'm not sure. It sounded a little like Colbie Caillat but I'm almost positive that it wasn't her. I the line that was repeated over and over was being said to someone and had the word "you" in it and maybe the word "again."