I normally tend to be swayed by a bit twisted harmonies - like when a choir or orchestra makes a proggression of beautiful chords with a little modernist dissonance into them.
But with Shore's compositions I seem to have been struck the most with the two quite archaic and moving solo-melodies.
First there is Eowyn's lament on the funeral which kind of let's shivers go through my spine everytime I hear it. There's simple beauty and emotional load in there. Sadly it's only on the extended DVD.
Secondly there is Billy Boyd's self-composed song which Pip sings in front of Denethor while Faramir and his men ran to the futile loss of life.
They're just beautiful!
As a nice sidenote I must say that "the Bridge of Khazad-Dûm" has an interesting kick to us Finns as the Maori-choir sings there repeatedly "musta-musta-musta" which in Finnish means "black-black-black". It really works!