REVIEW: “Show Boat” at The Glimmerglass Festival

by Roseann Cane   Show Boat, first produced by Florenz Ziegfeld in 1927, marked a turning point in theater history.. Appearing during a time when frothy entertainment like light-hearted operettas and revues packed the theater scene, this was likely the first musical driven by a serious plot, the first musical where book and music merged.…