We're not going to avoid comparing Grass Widow to Sleater-Kinney, the Northwest's most famous all-girl garage trio. But though both bands knit a loose fabric of guitar and vocal harmonies, and both have been on Kill Rock Stars, only one of them is still together and playing a free show with Sonic Youth this weekend. Grass Widow's video for "Shadow" depicts a gray-scale cityscape thronged with watercolor shadows smoking alone. It may look bleak, but it's enlivened by Lillian Maring's bubbling drums and Raven Mahon's insistent guitar.

Sonic Youth, Grass Widow, and Talk Normal play the Prospect Park Bandshell Saturday, July 31st at 7 p.m.