FotR music and it's associations

[Gerbil]

I've heard bits of the soundtrack (off to buy it tomorrow , and several bits immediately transport me back to the film.
Obvious ones are:

1) Lovey-dovey bit of Aragorn and Arwen on bridge
2) The whole Moria / Balrog bit
3) Shire music, the sweeping sweet bit when the camera pans up as the kids all leg it towards Gandalf

and my personal fave is:

4) The Isengard music which goes with the pan up Orthanc to Gandalf, who has a chat with Mr Moth, then the crescendo as the camera drops off the side and plunges down into the pits below Isengard (surely this must be where Saruman plumets to his death?)

Unmemorable bits include Boromir's death scene - can't for the life of me remember it at all.
Also, I really don't like the entrance to Lothlorien music.
And errr.... when in the film do they play that awful 'May it be' song? Either it's the credits or I blank it from my mind!