I don't really think that Bilbo composed the lyrics and Gandaf sent them to the brothers.
The dream was a prophecy. Bilbo, as good a poet as he was, did not make prophecies. He based some of his poems (like the Aragorn one) on existing prophecies, but he was no diviner.
If Gandalf indeed sent the dream, I don't think he even thought of the lyrics. He sent the idea, the purpose, you name it. The words came out because Elves and Men of high descent in ME happen to be poetic/musical.
But even that seems unlikely. The Gandalf that "ruthelessly persuaded" Thorin and Bilbo is only half-canonical, if you get my meaning. This was the same Gandalf who was afraid of wolves and threw pinecones at them from the top of a tree. Is it the same Gandalf who defeated the Balrog? TH is a bit of a different story, separate from the rest of ME...
And anyways, I don't think Gandalf is
that much into intrigue and politics to try to convert one of Denethor's sons so that he'd put pressure on his father.
I like what
Alatar proposed:
Quote:
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- The dream has no sender.
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This is probably the most realistic of the theories, IMO. But I think it's because the Numenorians, like Elves, had a bit of a divine side to them, not because of the Music. They all were inclined for a bit of prophecy here and there.