To find theme in a lyric poem, a reader should focus on... a the feeling at the heart of the poem
b characters
c the title
d plot

My english teacher once yelled at the class its the plot of a poem that tells you how a person is feeling because a title is just what the poem is called and charaters we dont know much about them but the feeling at the heart of the poem can also have a theme when you read the poem it has certain words and hidden meanings to what is being said therefore B and C is definetly off the table but A and D if you have multi A if one

i'm not sure i completely understand your question, but i will do my best.

i think the answer you are looking for is sequence. (see below)

a repeated melodic fragment would be best defined as repetition, while repeated chords (different or the same) could be a chord progression. however, you then mentioned the chord and melodic fragment beginning on higher or lower pitches, in that case, the answer could be best defined as a sequence. the definition of a sequence is as follows: "the restatement of a motif or longer melodic (or harmonic) passage at a higher or lower pitch in the same voice."

let me know if this !

hey

he was  an italian composer who wrote 39 operas, as well as some sacred music, songs, chamber music and piano pieces.

hope this and i wish you the best of luck! : )