“the electric guitar may be the most important and popular instrument of the last half-century in American music.” Why was it so important?

Answer :Certainly its introduction brought a major change to American musical technology and has shaped the sound and direction of modern musical styles

Explanation: i like guitars

answer michelangelo; i believe this is correct, plz check first good luck;

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 !