When Ethan Hanzlik isn’t feeling well, everyone around him knows.

“We got a call from a middle school teacher one time who asked whether everything was OK with Ethan,” his father, UConn trumpet professor Louis Hanzlik, says. “We told her he seemed all right, maybe a little down, and wondered why she was asking. She said he hadn’t been singing in the hallways like he usually did, because Ethan would walk around and just sing.”