White Snakes Project is set to present “Sing Out Strong” on May 13, 2020 at 8 p.m. The concert performance is a preview that will set up the world premiere showcases of “Cosmic Cowboy,” an opera by composer Elena Ruehr and librettist Cerise Jacobs at the Emerson Paramount Center. The opera is set to take the stage on Sept. 25-27. {…}