I really like the Lament to Gandalf theme. In the first movie, after Gandalf said "fly you fools", and fell, then Frodo yells, I like that the song playing. Everybody just came out of Moria, and they are sitting the rocks outside the gate mourning for him. The music playing there is really beautiful. I rewinded and played that part on the soundtrack so many times, it is permanently tatooed on my brain cells. It is just so sad and mournful, and full of sorrow, I cry everytime I hear that part and song. Aragorn goes,"Frodo"! And then Frodo turns around, and you can see that lone tear coursing down his cheek. I have no more tears left.
I also like the Sam and Frodo Hobbit theme. I also like The Grey Havens, Gollum's Song, and Into the West, and May It Be.
I sort of go into a trance when I hear Lament to Gandalf on the slopes of Moria. I'm about to cry now. Gotta go.
May the Grace of the Valar be with you. Amen