They were "beards of a feather," kindred spirits with a passion for music. During the course of a friendship that spanned four decades, two of America's musical powerhouses-Grateful Dead guitarist Jerry Garcia and mandolinist David Grisman-shared 44 recording sessions that produced an acclaimed body of work. Garcia was a lifelong bluegrass fan, while Grisman innovated the bluegrass-jazz hybrid "Dawg" music; together, they created the epitome of stringed synchronicity. Fans will enjoy interviews, rare concert footage, unreleased audio tracks and living room jam sessions, as director Gillian Grisman (David Grisman's daughter) captures the creative chemistry that marked this dynamic duo's musical magic. An insider's look at one of acoustic music's most endearing-and enduring-musical kinships.