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From David Thomson‘s Have You Seen…? A Personal Introduction to 1,000 Films:
The song [Yip Harburg and Harold Arlen‘s “Somewhere Over the Rainbow,” which Louis B. Mayer had tried to cut] is in the film. It won the Oscar for Best Song that year. And I think it is the moment where a very strange, confused movie puts its foot out on the ground and says “Home!” For the rest of her life, Garland could not get off a stage or a nightclub floor without singing the song. And no one should kid you that her life was better than wretched, yet maybe when she sang the song she was “home” And to this day, when that melody lifts, like eyes looking up at the sky, and you feel Judy or Dorothy becoming a woman, anyone who ever loved Hollywood is home.
You know the rest.
(p 982)