The evolution of the set of African-American music as a network of diverse and heterogeneous musical styles establishes an objective investigative perspective. This approach is addressed from the establishment of an organized set of Afro-North American music structured on several ethnomusicological and sociohistorical data. At the methodological level, the Social Network Analysis (SNA) is used for the visualization and analysis of the faced phenomenon, complemented in an analytical perspective with the musical comparison of a specific case of African American musical evolution. The results indicate a high stylistic cohesion between the different relationships perceived in the phenomenon addressed. At the musical level, there is the gradual increase in the harmonic complexity of a classic song from the Afro-North American repertoire. In addition, the approach to a transdisciplinary line of research in the international panorama of ethnomusicology and the sociology of music begins.