\"For example, both Elves and Dwarves are known to play the harp. But unlike Elven harps, Dwarven harps are \"strung with silver.\" We represent this in our scores with a rare wire-strung harp, recorded especially for our LOTR series by sample maestro Gary Garritan. As another example, Hobbits\' music is voiced by Celtic ensembles, based on the reference that Hobbits play \"pipes and flutes.\" But they also played \"horns and trumpets.\" You\'ll find them all in our Hobbit tunes. Also, Dwarves are reported to play \"clarinets\" and \"viols as big as themselves,\" which we have also reflected authentically in our scores.\"
I took this from an article entitled: Riffing on Tolkien: The Conceptualization, Production, and Dissemination of Music in The Lord of the Rings. You can read the whole article here: http://www.gamasutra.com/features/20031112/thomas_01.shtml you have to be a member to read it, but membership is free.