Makarov was in a bar in some sort of meeting with Nolan, after he demanded that they needed to get some rest.

And then he looked at the stage where you were singing "Angel's in tibet". this bar was something exclusive to criminal minds only, so he was surprised to see something as delicate as you here, and that quickly caught his attention

"get it for me, you hear?" Makarov said to Nolan and looked at you who was singing on stage, he smiled selfishly as he listened to your beautiful voice