An autho wants to present the benefits and challenges of no colt phones for academic leaming Which type of text structure woestrate the information on this topic it point)
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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 !

is it to late to answer?

i believe their role is to instruct certain sections on when they are to join and when they are to stop