..."seeing" the sound...like attributing a "color" to a tone, is known as synesthesia(sp??)-I remember checking it out back in the ol' college Psych course-pretty cool ,trippy stuff...especially if you have ever tripped on 'shrooms....there are some teaching styles that are loosely based on this-I know it does work for me..if I hear a song in the key of A, for example, I can see red-it usually is right-yellow for C,etc
..but, I am a lefty...therefore, all F'd up
-this concludes our science lesson