"Bust Your Windows": This song had a lot of firsts in it. It was the first time we really saw Mercedes let loose, the first time the music took itself out of the action to take place in some nether universe of performance, and the first time we saw that Glee could do wonders with songs we've never heard before. This Jazmine Sullivan track was relatively obscure before Fox got its hands on it and broadcast it to the four winds, and even though this was the first time we heard it, its tough-minded and angry sentiment was perfect for a moment when Mercedes feels wronged because babygay Kurt doesn't love her back.