Shakespeare's Silmarillion

Shakespeare's Silmarillion:

Melkor: do you think I am easier to be played on than a pipe? Call me what instrument you will - Eru: Mine. Melkor: I do not well understand that. Eru: I can fret you, I can play upon you. Mine instrument.

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I just wanted to add that it took me the longest time to see Eru's use of the word 'instrument' as a musical reference, despite that the entire metaphor of the Ainulindalë is musical. I had always seen 'instrument' as 'tool.' Once I made the connection, as blindingly obvious as things always are in hindsight, my mind leapt to Hamlet.