Hints & Solutions Edit
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If one item is a musical instrument, the other must be a weapon.
A quick Dictionary dot com search should provide most of the answers.
The Clavicembalo is a musical instrument and the Pappenheimer is a weapon.
The full solution and keyword is found in the next block of text. If you do not wish to be spoiled, please do not continue.
11. Bilbo Baggins
The middle sword (your Keyword), when ordered alphabetically, is "Schiavone".