"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. -- Duke Ellington"
The only problem with applying this quote is, none of us possess the ears or taste of an Ellington! As long as we interpret "successful" to mean as "it sounds good to me", aren't we simply rationalizing our personal preferences? I don't believe this is what Ellington had in mind.