We already posted the details about most of the MusicFest NW lineup, but now the festival has grown by a day, and added the headlining power of some band named Modest Mouse. But it's not just the Mouse, the entire Glacial Pace Recordings label—Love as Laughter, Mimicking Birds, Morning Teleportation—will take part in a showcase at the Crystal Ballroom on the Sunday, September 20th.