[ Distracted as he was, Peter failed to notice other people approaching. He misses his next note, fingers pausing abruptly, and looks up towards the voice. He's never spoken to Kaidan before, but he recognizes the clothes as one of his family members and gives a smile. ]

Thanks. I'm a little rusty, actually. I learned when I was a kid, and then I didn't exactly have much time to practice growing up. Not a lot of pianos in space. But it's a bit like riding a bike, some things you never forget.