Would you post the LOTR music as a torrent, so all the people who didn't buy it can then have it? i didn't think so. Putting it for pirate download and putting it in your mod are the same thing. You don't have to make any money, the problem is the owners of the copyright won't either and thats why you will be sued. The mod itself is not piracy because such things are mostly ignored as fan art.
NOW, as to the music TLD will have, i may suggest to the guys if they would like to post a track for you all to hear at some point. Just like the guys are working hard on the mod, i too am working hard on the music to compliment their work, and there is a lot of it. More then native. Also, consider for a moment why the LOTR film music doesn't work. Much of the film music is samish (albeit awesome), gondor, rohan the elves and orcs have theme music,. what about everyone else? Rhun, Khand, Dwarves, Haradrim and the rest of the easterlings, Dunland and so on. you going to have the same film music playing over and over and over and over for battles,towns,map,siege,arena yadda yadda. that would get tired quickly i think.
These guys (TLD Dev team) have made the tolkein world, more far reaching and all encompassing then any official game and the movies combined ever have, it seems to me TLD is setting the standard for LOTR gaming, it deserves no less then ITS OWN soundtrack. i hope i can do it justice.