Maby I'm explaining it the wrong way ..It can't be the language barrier, as my english is excellent
erm..let's try it this way.... What consitutes art? A TRUE work of arn't can't really be something anyone can make in 5 minutes, now can it? Sure, some so-called artists take a load off in a bath tub and present that as art, but you can hardly call it that!
And yeah, I know some people will thinks it's art, but that proves nothing. No matter how redicolus a idea you can think of I can guarantee you'll find someone somewhere on this planet that will like it. Figures, there's 6 billions of us and at least half are idiots.
Art should be something that requires time, great skill and effort to make..something very few can make - like the statue of David, the Mona Lisa..or Mozarts or Beethowens simphonies..Those are not things that can be emulated by every regular Joe on the street.
That's why I consider rap inferior - everyone can do it. Now things like classical music not only require great skill, and effort to compose, they also require great skill and effort to preform.
And, IIRC it's been proven that classical music has benefical influence on an infants development, while rap has a negative one.
There you got - two mesurable things. Others are not nearly as easy to quantifyand are more abstract, but whatever...