I remember seeing ROTJ in the movie theater on opening day in 1983 (I think I saw it 2 more times that summer) and being so moved by Luke and Leia's theme, and the church-like music during Luke and Vader's duel (right after Vader tricks Luke into coming out of hiding by threatening Leia). I remember buying the LP of the soundtrack and being so disappointed that that duel piece wasn't on it. I was thrilled when the Star Wars Anthology CD-boxed set came out, and I was FINALLY able to listen to that piece on CD.

I guess I wasn't the only one, because Ben Burtt mentioned (in the DVD commentary, I think) how so many people mentioned that particular piece of music to him, and asked where they could get it.