John Holiday is rocking the opera world! Fresh off an impressive New York City performance, />http://www.nytimes.com/2015/03/11/arts/music/julius-rudel-gala-benefits-city-opera-revival-hopes.html?_r=0/> international performances are scheduled in Krakow, Poland and Versailles, France. Upcoming performances stateside are scheduled at the Spoleto Festival USA in Charleston, South Carolina;…