Last Saturday evening at about 8 p.m. I entered Fairchild Chapel, beginning the arduous wait until ambient singer-songwriter Liz Harris, also known as Grouper, arrived onstage. The opening act, cave weta, didn’t come until 8:45 p.m. His performance began with a quiet, high-pitched hum, which served as the basis for the rest of the song, as the manipulation of some pedals and hearty doses of feedback kept the once-feeble sound going for the next 15 minutes. At times, the performance, characterized by deep drones with peculiar textures, was lovely. cave weta shone especially towards the end when vocal loops were incorporated into the mix, adding a more human and melodic element to the formidable wall of sound. At some...