Hmm.. you've slightly stumped me.
The poem was given to his secretary, Joy Hill, in 1966 as a present. (There's a story around it, about a silver bracelet). So that's the first part, but I'm not sure about the second. The poem was put to music by Donald Swann, for the "The Road Goes Ever On and On 2nd collection" set. (which I own.
) Then it was illustrated as a poster later on. I'm not sure either of those answers are what you're looking for, though. Here's hoping someone has a better memory than me.