California sisters Haim paid a visit to New York this past Monday for an appearance on the Late Show with David Letterman. The west-coast trio impressed the Late Show audience (including Dave himself), with a rousing performance of their single, “Forever.” No full-length from the band is out yet, but rumor has it, their debut album is well on the way (hopefully out by the fall). Watch the performance below, and don’t miss them later on in June, when they’ll be peforming at the Firefly Music Festival in Dover, DE, on the 23rd. Tickets and information can be found here.