I adore the music, I have it all on CD and in my iTunes system.
We do quote the "Mines of Moria" phrase in that accent
"You Shall Not Pass!" is another favorite of mine. Although that segues into another of my pet peeves. Jackson felt it was VERY clear in that scene that the ledge Gandalf was clinging to was actively crumbling and that the reason he deliberately lets go is to prevent anyone from dying, too, by going out to rescue him. But I've talked with several people who thought the ledge looked nice and solid. It would have been so easy for the filmmakers to show little pebbles and fissures forming to make it nice and clear that Gandalf was deliberately sacrificing himself to save the others. But I suppose it's hard to think of everything