“Grizzly Bear songs rarely fare well in isolation. This was especially true of “Three Rings,” the swirling six-minute lead single from their just-announced Painted Ruins, which felt more like a piece of a larger puzzle than a single-serving like “Two Weeks.” The second offering from the album, “Mourning Sound,” gets quickly to the point, though, riding a blunt bassline, a sweeping Ed Droste verse, ”