[Gayalondiel]

If you're after the songs themselves, Donald Swann set some of them to music in collaboration with JRRT. There is an album called... ohh help... if no-one posts with the name then i'll post it when i remember... anyway he set songs of LOTR to piano accompaniment. 'Namarie' is particularly good.
You can also get tapes of JRRT hiself reading some of the poems, and he sings 'Namarie' and Sam's troll song. That tape is also really worth a listen, and again i can't remember what its called. but if you can find it, do get it.