greg stephens -said:
>>>Marlon Brando sang a snatch of "Long gone Lost John" in a film I've been trying to identify for years, and nobody remembers this except me, so if you could add the name of this film here I'd be eternally grateful.<<<

Is that the film that was the ill-advised prequel to The Innocents (AKA Turn of The Screw)? He plays Peter Quint and I think maybe Stephanie Beacham plays Miss Jessup?