Final answer:
Rap music emerged in the 1980s as a cultural movement from inner cities, combining elements of funk with beats and lyrics. It has been a medium for self-expression, addressing social issues, and has gained recognition as a respected art form.
Step-by-step explanation:
Rap music, or hip-hop, stands out from previous forms of American popular music in several ways. First, it emerged in the 1980s as a cultural movement that originated from inner cities and spread to small towns. Unlike its predecessors, rap combined elements of 1970s funk with beats and lyrics to create a new sound that resonated with many audiences. Second, rap music has been a medium for artists to express their experiences and opinions, addressing issues such as inner-city life and racism. Finally, the evolution of rap has led to increased acceptance and recognition of it as a respected art form, with rappers like Kendrick Lamar receiving prestigious accolades such as a Pulitzer Prize for music.