The site Record Brother has posted MP3s of J.R.R. Tolkien reading and singing from The Lord of the Rings. He laments not having the entirety of the release, but I could have sworn I had heard some of this before: and a commenter confirmed it--you can buy a version of it on CD at Amazon. We love material read by the authors. And none of the songs will remind you of Leonard Nimoy's "Bilbo Baggins," so stay calm.
Pointer to the MP3s provided by Neatorama.