Vanguard Records will release Newport Folk Festival, Best of Bluegrass 1959-66 on Tuesday (April 10). Featuring live tracks culled from the famous festival, the set features Bill Monroe, Flatt & Scruggs, the Stanley Brothers, Jim & Jesse, Hazel Dickens and others. The package offers 16 previously unreleased tracks. ... Junior Brown will open for the Dave Matthews Band July 25 at Nashville's AmSouth Amphitheater.