Yarn Owl.
It isn't until the refrain in the back third of the song that it really wins you over. The beginning, begging to be sound in a round, or at least with some harmonies, is the kind of mossy, woodsy thing we expect and love from the Pacific Northwest. It reminds you of hitting sticks against trees in the woods behind your house, all damp, all covered in rich soil. But the final part, where the harmony kicks in and they sing about the girl coming home from her library is the what makes you really want to hear the rest of the tape.
And it is in fact a tape. You can pick it up from the folks at Leftist Nautical Antiques, who are having some nice holiday sales on cassette bundles right now.