@RedDevil You are totally right in one way and I felt that you kind of owned me there. However, with Q1 I mean more like: "Would people think that a song would be much better if it was made by a famous artist than if it was made by an unknown artist."

I will take a look at the wikipedia links you posted.

Answer to your "P.S": There are many questions that need to be answered by personal opinions. That makes discussion, right?