I thought this thread was going to be about how Titanic originally had a bunch of Enya's songs while courting her as composer (most notably "Book of Days" in the wide establishing shot of the oceanborne ship), but then usage negotiations fell through so Horner composed a bunch of strikingly-similar replacements to fill the gap.
Oh wow, really? I knew the one piece sampled “Book Of Days” but not that her music was going to be used. I love Enya’s stuff, it would have been really interesting to have it in the film.