Kept Under Glass: Unheard Women’s Voices was a performance last night at the Whitman-Walker Corner, sponsored by the Goethe-Institut, the Austrian Cultural Forum, IN Series Opera Company, and Spooky Action Theater. Three opera singers sang in different bay windows, with the audience standing outside on the sidewalk. They sang a spectrum of under-represented German and Austrian women’s works from across eight centuries, with some of the translated lyrics, singers’s faces, and other visuals projected on the building. A magical performance, even more so after the dearth of live performances this past year.