What are the three basic types of trends which influence the development and evolution of popular music?

The three basic types of trends that influence the development and evolution of popular music are technological innovations, cultural shifts, and social movements. Technological advancements, such as the introduction of new instruments and recording techniques, have shaped how music is created and consumed. Cultural shifts reflect changes in societal values and tastes, often leading to the emergence of new genres. Lastly, social movements can inspire music that resonates with collective sentiments, driving themes and styles in popular music.