Hamilton music style?

How does the poem's mood and tone change in each of these stages of “o captain! my captain! ” by walt whitman? (i need an answer asap )

Let freedom ring from the snow capped rockies of colorado what is the rhetorical device? a. imagery b. simile c. anaphor d oxymoron

Match each stanza structure to the correct term. a stanza of two lines quatrain a stanza of four lines octave a stanza of six lines couplet a stanza of eight lines sestet arrowboth arrowboth arrowboth arrowboth