This section of rapscience presents a theory of how rap works musically: The focus is on the sonic organization of rap, not the meaning of the words. This is what is referred to as the rap flow.
Rap combines elements of poetry and music into a unique art form. Thus, understanding rap flow requires some understanding of music theory and linguistics, which each have their own page here. These pages give us the necessary vocabulary and theoretical framework to discuss how rap flow works. Once you understand the music theory and linguistics material, you'll be ready to jump into the real rap flow theory page.