“Something's happening in the country/And the government's to blame/ We got married in a gold rush/And the rush has never felt the same.” Those opening lyrics from “Married in a Gold Rush,” from the latest Vampire Weekend album, Father of the Bride, perfectly entwine the running themes of the album: what it means to exist in a relationship, in a country, and on a planet that seems every day to be documenting its own demise. But for such a fatalistic album, it’s got a remarkably chill sound, and considering this new sense of simplicity—and it’s important not to confuse simplicity with shallowness here—it makes sense that Vampire Weekend is performing a rare unplugged acoustic set at the Crystal Ballroom. Koenig duets with HAIM’s Danielle Haim on a few of Father of the Bride’s best songs, heightening the theme of a crumbling relationship, so here’s hoping we get a special appearance at the show. But even if it’s just the band’s core members, that will be more than enough to fill the venue with the album’s warm, meditative sound. by Blair Stenvick