Amazing grace song

How can I find out where amazing grace song is sung in movies

Like in movies soundtrack

Also is there any mainstream big movies where it was used ?

Just Google it.
The song has been used in hundreds of films, if not thousands.

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Any ideas ? Big movies ?

Rodent's right, there are so many examples you should just search for it. You can Google it, or look on IMDB's search, which I've linked here for you.

Well, for a start, there is the movie "Amazing Grace" . . .

It was played - the melody without words-in Invasion of the Body Snatchers - the version starring Donald Sutherland