“Christine Lauterburg, a musician from Bern, has layered yodeling over techno beats, and that simply isn’t done. She wears a miniskirt and heels on stage, rather than the Alpine peasant dresses worn by performers sanctioned by the Swiss Yodeling Association, the keeper of the flame. The outfit, called a dirndl, isn’t optional. Ms. Lauterburg isn’t alone in her heresy.”