genre vs musical style

genre and musical style both are nouns.

Word	Noun	Adjective	Verb	Adverb
genre	Yes	No	No	No
musical style	Yes	No	No	No

As nouns, musical style is a hyponym of genre; that is, musical style is a word with a more specific, narrower meaning than genre:

Other hyponyms of genre include music genre, musical genre.

genre (noun)	musical style (noun)
a class of art (or artistic endeavor) having a characteristic form or technique	an expressive style of music
a kind of literary or artistic work
a style of expressing yourself in writing