HICKSVILLE, N.Y., April 25, 2011 /PRNewswire/ -- Rock history was made at Sam Ash Music as Mike Portnoy (Dream Theater /Avenged Sevenfold), Dave Ellefson (Megadeth), Charlie Benante (Anthrax) and Frank Bello (Anthrax) shared the stage for the first time ever for a once-in-a-lifetime performance clin