In 1974, MGM Studios released its first compilation of musical highlights from 45 years of Hollywood extravaganzas. Entitled That's Entertainment!, it was a big box-office hit and inspired a second compilation two years later. Eighteen years went by before MGM tried again. The third installment of the series contains a total of 62 musical numbers and includes scenes from more than 100 films. The cavalcade of memories is hosted by nine stars from the old musicals: Gene Kelly, Esther Williams, Debbie Reynolds, Mickey Rooney, Lena Horne, June Allyson, Cyd Charisse, Ann Miller, and Howard Keel. The film is loaded with outtakes and unfinished numbers that didn't make the cut of the original musicals. At many points, there is a split screen, showing the finished product as filmed as well as behind-the-scenes confusion. It's as much a comic "bloopers" TV show as a tribute to the heyday of the musical.
by Michael Betzold synopsis