She even went on to marry Jack Haley, Jr., the same year That's Entertainment! was released. The one youngster in the cast was Liza Minnelli, but she fit in perfectly as the daughter of the studio's greatest singing star, Judy Garland, and it's most honored musical director, Vincente Minnelli. To introduce the clips, Haley assembled an all-star cast including former MGM contract players like Frank Sinatra and Elizabeth Taylor and performers like Donald O'Connor ( Singin' in the Rain, 1952) and Bing Crosby ( High Society, 1956) who had scored career triumphs at MGM. Editors Bud Friedgen and David Blewitt cut together highlights from 84 different musical numbers, shortening some numbers seamlessly and cutting them all together with a fluidity that kept the 127-minute film moving at a rapid pace. Haley and his crew spent 19 months pouring through the studio's archives to find clips from more than 200 features and shorts that captured the feel of MGM and its musicals. The film was supervised by studio production chief Daniel Melnick, but the familiar name all over the credits - as producer, director and writer - was the studio's head of creative affairs, Jack Haley, Jr., son of the vaudeville star who achieved immortality as the Tin Woodsman in The Wizard of Oz (1939). Rosenfelt heralded the studio's golden anniversary by announcing that "the roar of Leo the Lion will not be reduced to a weak meow." With That's Entertainment!, he proved that Leo's roar was far from forgotten, either. The once glorious studio only released five films that year. The result was the most popular compilation film ever made - That's Entertainment!. It was only natural that for the studio's on-screen 50th anniversary celebration in 1974, it present a compilation of great numbers from some of the greatest musicals ever made. Never was this philosophy more in evidence than in the studio's musicals - the best and smartest Hollywood had to offer. "Make it good.Make it big.Give it class" was one of MGM's mottoes during the studio's golden years.