Synaesthesia--see Beetoven's Fifth

One of the most famous and glorious pieces of music ever!

Where is music? In the physical sounds? In the Platonic forms? In the structures in created by the sounds? 

This video helps us go beyond the sensual music...

This seems to me to be important for epistemology and metaphysics students. The empiricists say that what we perceive gives us true knowledge. But the experience of listening to (perceiving) music seems to raise a question: where is the music? Is it in the score we see here--the visual representation? If all we heard were the sounds without the structure, what then?

Does a musician hear more music than someone who does not know music theory?