A very interesting JRRT letter on Bombadil has recently come to light, written to fellow Inkling Nevill Coghill shortly after the publication of FR. It was posted on Wayne Hammond & Christina Scull's blog (with Estate permission), and I think it is well worth reading as Tolkien's considered comments on Bombadil to an intelligent and sympathetic reader:
But Tom Bombadil is just as he is. Just an odd ‘fact’ of that world. He won’t be explained, because as long as you are (as in this tale you are meant to be) concentrated on the Ring, he is inexplicable. But he’s there – a reminder of the truth (as I see it) that the world is so large and manifold that if you take one facet and fix your mind and heart on it, there is always something that does not come in to that story/argument/approach.......
More at
http://wayneandchristina.wordpress.c...da-corrigenda/