THE SONG PLAYING IN THE BACKGROUND IS "FEEL IT COMING" BY SARA MELSON, WATCH THE VIDEO HERE:http://www.yout ube.com/watch?v=wIAP Fv-Wxn0
From episode 4x10, "Crash into me" part 2, the closing montage. Lexie, Cristina and Meredith drink & dance, George and Izzie break up, and join the dancing. It got me all teary eyed. And smiling at the same time. Grey's does weird things to me.