Its all about appreciation of music which is very subjective and why we all like different styles, we all have ears that tune into different frequencies, feeling the music is when you are playing an instrument and hitting the right frequencies that sounds good to you and hopefully to others. As far as I am concerned musical theory is just an old fashioned concept unless of course you are playing classical music, in the world of rock and pop it is sort of irrelevant other than the circle of fifths.