One of these original Broadway cast recordings on a CD would be a cause for celebration. To have four, on a double album, at such a budget price, is something wonderful. Devotees of the genre will not need urging to replace their vinyl copies if they haven't already done so, but those less familiar with the details should not hesitate.
"Oklahoma!", "Carousel" and "The King And I" were all written by Richard Rodgers & Oscar Hammerstein II, and Irving Berlin wrote both words and music for "Annie Get Your Gun". Recordings date from 1943, 1945, 1951, and 1946 respectively but you'd be hard put to it to tell that. Each contained songs that have since become standards ("Oh, What A Beautiful Mornin'", "You'll Never Walk Alone", "I Have Dreamed", and "There's No Business Like Show Business", to identify just one each) and all were adapted for the silver screen.