Where's the difference !!!

Often during my school days,I was confronted by a question-Why is there so much disparity in academic performance?The complete answer was not in the effort they put in.I knew some students who slogged and labored much harder than me,but to little gain.They were pretty serious and hard-working,but this didn't reflect in their performance,and more often than not,their grasp of the fundamentals.And I outrightly rejected answers like 'They are less 'brainy''.Why this partiality?College drastically changed my outlook towards teaching..So I left my pursuit before finding sth satisfactory.Today I stumbled upon a story that made me pause and look back.

A student asked his teacher the same question.He was asked to wait.Next day,when the teacher was in his class,he fired a question at the class.

"How many of you regularly listen to music?".
Almost all the hands went up in the air.
"How many of you play a musical instrument?"
A small fraction of hands remained upright.
"How many of you can read music?"
Still fewer hands.
"How many of you can sight read the score and play it at the same time".
A chosen few hands still survived. 
And then came the masterstroke
"How many of you can read the score and hear the music straightaway?".
The number of hands is immaterial.The beauty of the question suffices.
The story is open to interpretation.But I think I have got hold of the answer now.The answer is passion.Different students had different degrees of passion towards music.Most of them were casuals and they would never be able to make out head or tail of the mystery of music,regardless of how much they listen.For another guy,music might be embedded in his existence.Someone can teach you to play an instrument.If you hang in long enough,you will learn to read a musical score.Maybe your instructor will make you see a piece and give an impromptu recital.But no teacher,no school on the face of this earth will teach you to convert dry words into music.This is something that you will learn out of your own yearning,your burning desire to delve deeper.This is passion in its purest form.This is what will bring about the difference.