I've had bouts of mild synesthesia, mine corresponds to notes however and not timbre or instrument or style. A is red, B is yellow, G is green, D is also red but darker, C is blue, F is purple, E is black. I do not know if it is a result of some long forgotten color association, but to this day I hear notes as colors. Sometimes it's stronger than others, and sometimes it's not even there. My friend Mark also has synesthesia but to a much greater degree. For me it's not so much as seeing the color when I hear a note, it's more of an idea of the color when I hear it which leads me to believe it is some abstract memory mechanism I developed as opposed to full blown synesthesia.