How did the contributions of Berry Gordy Jr. and Motown influence the history and development
of popular music in the twentieth century?

Berry Gordy Jr. as a songwriter with his Motown Records, established the first high stream black music production that launched rhythm and blues mega hits and influenced popular music by introducing black singers and their sounds.

Explanation:

Berry Gordy Jr estabilished Motown Record Corporation in April 1960. Immediately it become a word-wide popular by producing mega hits including 'Money", 'Shop Around', and other popular R&B music.

Motown Records dicovered many music talents, including Diana Ross. It was involved in Broadway production, cooperating with Gordy and other partners on sucessful projects such such is adaptation of 'The Wizz' musical.

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 !

homophonic or a tonal