We need detached music. Without it, it’d be impossible to make it from October to January, let alone March. Few artists are as cherished in winter as Grouper, the solo project of Portland artist Liz Harris. Her morose album titles, like 2008’s Dragging a Dead Deer Up a Hill and 2013’s The Man Who Died in His Boat, make it difficult to recommend her records to a friend without receiving a worried look in return, but as soon as someone begins their tumble into her textured drone, the appeal is obvious. Grouper illuminates sadness by giving our sighs a voice.