Rowan Carrick: she’s a 19-year old Puget Sound freshman with curly blonde hair, an interest in English studies, a spot in the S.U.B. work force and a near constant ball of workload-related stress festering in her stomach. She’s also a professional recording artist. “When I was growing up, my dad used to play the chanter and sing me songs—the chanter is the reed instrument that connects to bagpipes—so I started singing with him,” Carrick said. “We’d make up little jigs. I wrote my first song when I was three.” The...