[Prozac]

So if a musician just learns some notes and chords and has never heard a song in his life, that means he can write good music? Becasue that's the line of reasoning that you are presenting.
Nothing is original, everything is based off of something.
How does one become great? By studying the examples of past greatness, learning them, embedding them into their charachter, and starting the motor of creativity within themselves on a solid foundation of proven success.