Final answer:
Drum ensembles, call-and-response patterns, and polyphonic singing are key musical manifestations of the African emphasis on community, involving participation from both performers and audiences, and influencing various styles of American music.
Step-by-step explanation:
The musical manifestations of the African emphasis on community are primarily found in drum ensembles, call-and-response patterns, and polyphonic singing. Drum ensembles and communal rhythmic activities, such as 'patting juba', served as a means of communication and a way to maintain a sense of community among African Americans. Call-and-response patterns in music and dance, where the leader initiates a call that is echoed by the group, not only involve participation from performers but also encourage audience engagement, enhancing the feeling of community.
Additionally, polyphonic singing and polyrhythms in African American music contribute to the sense of communal participation. These musical elements require a level of coordination and cooperation among performers, reflecting the value of community inherent in African cultures. Furthermore, these practices have significantly influenced the development of various styles of American music, embedding the essence of community within the fabric of American cultural expression.