(AMHERST, Mass.) – The Grammy Award-winning Klezmatics and Yiddish/hip-hop superstar Socalled headline YIDSTOCK: The Festival of New Yiddish Music, at the Yiddish Book Center the weekend of July 14-15, 2012. The five-day event, which begins on July 11 and also features performances by Frank London’s Klezmer Brass Allstars with vocalist Eleanor Reissa, the Michael Winograd…