The Book of Merman: Merman meets Mormons in the musical tale of Missionaries attempting to “save’ the legendary Broadway belter. In Flying Elephant’s production, composer Leo Schwartz packs the score with original music to tell a tale of self-discovery, showtimes and evangelizing youth. Runs through Jan. 6 at Stage 773, 1225 W. Belmont Ave. Tickets are $40; visit Stage773.com.