Victoire & Sirius
"I can be remarkably in control, when I need to be," Sirius replied with a smirk. He didn't want to tell her where he learned such self control: in Azkaban, the slightest positive emotion brought the Dementors to his cell. The resultant torture was impetus enough not to want it happen again, and so it was a matter of survival.
Focusing on the music, he needed to change the topic to get his mind off what he really wanted. "I've never heard this song before. It's probably from my future... do you know who it's by?"