One of the first urban bands to play bluegrass, the Greenbriar Boys were instrumental in transforming the sounds of the hill country from a Southern music to an international phenomenon. The Greenbriar Boys first came together during informal Sunday afternoon jam sessions at New York's Washington Square Park. The impetus for the group, however, had been conceived a few years before, when New York-born John Herald met banjo ace Eric Weissberg at the University of Wisconsin. Inspired by Weissberg's repertoire of Bill Monroe, Flatt & Scruggs, and Don Reno tunes, Herald acquired a...