FOLK FORWARD - NEXT GENERATION Shel SHEL Based in Fort Collins, Colo., sisters Sarah, Hannah, Eva and Liza Holbrook are classically trained musicians whose songs meld ethereal harmonies, out-of-the-box melodies and remarkable musicianship. Producer Brent Maher, who’s worked with everyone from Ike & Tina Turner to the Judds, co-produced SHEL’s When the Dragon Came Down EP and is working on a full-length follow-up. John Fullbright JOHN FULLBRIGHT Hailing...