Well my other theory excluded not only Bilbo ( who is obviously so near death anyway) but also Gandalf .... in this scenario the cello continuo is Frodo, quiet, calm and decided on his course of action and the three violins Sam, Merry and Pippin who are stunned,attempt to persuade, grieve and then fall into acceptance and harmony in the last bars... I guess that may work better....
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“But Finrod walks with Finarfin his father beneath the trees in Eldamar.”
Christopher Tolkien, Requiescat in pace
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