METAL SLUDGE EXCLUSIVE: Rock documentary “Inside L.A. Metal” premieres in Hollywood in a rousing success By Gerry Gittelson Metal Sludge Editor at Large   LOS ANGELES — The heavily anticipated rock documentary film “Inside L.A Metal” celebrated its screen opening on Tuesday, June 3 at the Beverly Theatre, and oh what a star-studded spectacle the event was. Produced and written by California freelance journalist Bob Nalbandian, the movie is primed to be a huge[…]