Final answer:
The technique called sampling significantly influenced the development of rap music in the 1970s and 1980s, allowing for the reuse of song portions and creating complex sound layers.
Step-by-step explanation:
The technique that had far-reaching effects on the development of rap music in the 1970s and 1980s is sampling. The original version of hip hop often featured a DJ who used turntables to manipulate vinyl records and create beats. This allowed DJs and producers to reuse portions of other songs and sounds, profoundly influencing the genre's evolution.
Sampling has continued to be a fundamental element in hip hop music, shaping its form and allowing artists to produce complex layers of sound and reference past works in their music.