As the Duke said "there are simply two kinds of music, good music and the other kind ... the only yardstick by which the result should be judged is simply that of how it sounds. If it sounds good it's successful; if it doesn't it has failed."
This is from a person who knew a lot about jazz and doubtless something about the blues as well. A man and a woman can argue endlessly about their differences but if they allow the differences to mingle the result is spectacular. If you don't know what I mean ask your Dad.