Movie/Music Genres

So since you can take the structuralist view of myths and stories, etc, you must be able to take a structuralist view on things such as music and movies. Would all the different genres of movies and music like country, rap, alternative, romance, thriller, etc be described as structuralist analysis'/larger sets of conventions?... I think so...
If so, how do you break those genres down into smaller conventions? Any ideas?
There are so many different music genres for example, I don't always know how to categorize what I am listening to; some are obvious, but then others aren't... to me anyway.
Heres a short list of some:
-Blues -Children's -Classical -Country
-Electronic -Folk/Traditional -Jazz -New Age
-R&B and Soul -Rap/Hip-Hop -Reggae -Religious
-Rock -Pop -Metal -Oldies
-Alternative...

If anybody's got any ideas for this, please let me know!