Final answer:
The line 'O you are well tuned now! But I'll set down the pegs that make this music' is an example of a metaphor.
Step-by-step explanation:
The line 'O you are well tuned now! But I'll set down the pegs that make this music' is an example of a metaphor.
A metaphor is a direct comparison between two unlike things, without using like or as. In this line from a poem, the author compares the well-tuned state to music by saying 'O you are well tuned now! But I'll set down the pegs that make this music'. The author is comparing the state of being well-tuned to the sound and harmony of music, using the metaphorical language.