What is the rumba known for in its musical structure?

The rumba is particularly known for its musical structure that features improvised verses and repetitive call and response sections. This characteristic is integral to the performance style of rumba, emphasizing the interaction between singers and musicians, which enhances the communal and participatory aspect of the genre. The call and response format allows for a dynamic exchange, fostering improvisation within the established musical framework. This improvisation is a hallmark of rumba, distinguishing it from more rigid styles characterized by strictly written compositions.

In contrast, the other options do not capture the essence of rumba accurately. Rumba traditionally encompasses both vocal and instrumental improvisation, so a focus on strictly written compositions misses the core of this genre. While electronic instruments may be used in modern adaptations of music styles, rumba as a genre does not exclusively utilize electronics. Additionally, while there are solo performances in rumba, it is celebrated as a social dance that often involves couples and group participation, rather than being limited to solo dances.