Chvrches play such bright, sparkling synthpop that it can be hard to imagine singer Lauren Mayberry’s voice on any other kind of music. But Mayberry got her start in Glasgow’s notoriously depressed indie rock scene, so it makes every kind of sense that she’d be down with the National. This past weekend, the National and Chvrches both played at San Francisco’s Outside Lands festival, and Mayberry joined the National onstage when they played their 2014 single “I Need My Girl.” She sounded great, with her voice and Matt Berninger’s unlocking some kind of yin-and-yang thing that felt new for both of them. They should sing together more often. Watch a fan-made video below.

The National also recently debuted the new song “Roman Candle.” Thanks to reader Dup Crosson for the tip.