black music vs musical style

black music and musical style both are nouns.

Word	Noun	Adjective	Verb	Adverb
black music	Yes	No	No	No
musical style	Yes	No	No	No

As nouns, musical style is a hypernym of black music; that is, musical style is a word with a broader meaning than black music:

black music: music created by African-American musicians; early forms were songs that had a melodic line and a strong rhythmic beat with repeated choruses
musical style: an expressive style of music

Other hypernyms of black music include music genre, musical genre.

black music (noun)	musical style (noun)
music created by African-American musicians; early forms were songs that had a melodic line and a strong rhythmic beat with repeated choruses	an expressive style of music