That Was Entertainment: The Golden Age of the MGM Musical traces the development of the MGM musical from The Broadway Melody (1929) through its heyday in the 1940s and 1950s and its decline in the 1960s, culminating in the notorious 1970 MGM auction when Judy Garland's ruby slippers from The Wizard of Oz, Charlton Heston's chariot from Ben-Hur, and Fred Astaire's trousers and dress shirt from Royal Wedding vanished...