It took Ari Picker—the composer and songwriter who leads Chapel Hill’s orchestrally inclined Lost in the Trees—four years to follow up 2008’s All Alone in an Empty House. Though the record was reissued and expanded in 2010, Picker didn’t debut a full collection of new songs until this year’s haunting and fractured A Church That Fits Our Needs, an extension of All Alone‘s narrative and a tribute to his late mother. It seems that listeners won’t have to wait another four years for the Tress’ next effort. The band recently played a session at the Los Angeles-based radio station KCRW and premiered a new song during the performance. The tune, called “Glass Harp,” represents a tasteful evolution of the group’s sound. The keyboard added to approximate A Church‘s complex arrangements is utilized in a pensive, reverb-rich piano part. Picker switches to an electric guitar, too, while effects create gauzy tangles from violin solos. The result is a gracefully distorted wash of melody and rhythm that pushes the Trees into new territory without forsaking their identity. Lost in the Trees’ entire KCRW session is available here.