Watch this examination of "Over the Rainbow":
I don't think I need remind you that we have The Wizard of Oz on DVD [DVD WIZ] and The Wizard of Oz: Selections from the Original Motion Picture Soundtrack [CD SOUNDTRACK WIZ].
If you've never read the Oz books, you could probably start with The Annotated Wizard of Oz: The Wonderful Wizard of Oz [F BAU]. We also have other books in the series in the children's section [J BAU].
If you have read the book and it has stuck with you, you're not alone. In Oz: The Hundredth Anniversary Celebration [J OZ], "...writers and artists express the influence that the book "The Wizard of Oz" had on them."