Tolys frowns a bit at the annoyance on the other boy's face--he knows the boy is older and while he tries not to believe the more ridiculous opinions on the various houses he's heard a lot of things about Slytherins. More importantly, though, Tolys doesn't want to be taken as rude.

"You're a good singer," he said, "I just don't think some people would appreciate it."

The librarian, specifically.