It's not just the scores, but the scene and score together to form perfection. Here are some of my faves, as examples:
Finding Boo from To Kill A Mockingbird - wherein Scout discovers Boo Radley hiding behind the door of Jem's room. One of the most beautiful moments in all of film thanks to the combo platter of Robert Mulligan, Harper Lee, Horton Foote, Robert Duvall, and most especially Elmer Bernstein.
She Knows, She Knows from The Miracle Worker - wherein Helen Keller finally understands. Arthur Penn's direction, Patty Duke and Anne Bancroft's performances, and the brilliant underscore of Laurence Rosenthal - unforgettable, and never fails to bring tears to my eyes.
The Murder from Psycho - talk about music informing a visual sequence.
The Book People from Fahrenheit 451 - Mr. Herrmann's final cue turns a beautifully shot sequence into high art and poetry.