Well, even though I thought I saw somewhere that Cabaret was
officially credited as being based on the the film of I Am A Camera, though I knew that it was a play first. But I guess I'm wrong.
I've seen from a few sources that My Fair Lady is more closely based on a film of Pygmalion than the original Shaw play, though, of course, it officially credits the play as the source material.
"Who is Stephen Sondheim?" -roninjoey
"The man who wishes he had written Phantom of the Opera!" - SueleenGay
GO CARDINALS!!!