synaesthesia is such a cool thing to experience. I am blind and still synaesthetic. It all started out with me realizing as a child that every digit (I later found out it works for small numbers as well) has a dedicated colour. Helped me a lot learning to deal with numbers in my head. I (as most synaesthetics do) originally thought this is the way it works for everyone. Took a while until I figured out that you're being treated weirdly if you mention numbers and words having colours.

With music, I tend to get a carpet of all sorts of visual effects. I cant even begin to name specific colours or patterns. It is not very defined, as most of my visualisations are these days. Edges tend to blur from year to year once you finally lost your sight completely. But the myriad of colour and shapes is still there.