Sounds like Synesthesia to me...

"Målandet är lika viktig som musiken, förklarar Anthony och säger att han inte skiljer de två:
- Färger och musik, jag ser dem, jag hör dem. Jag tror inte på att människan bara skulle ha fem sinnen, de ytterligare sinnena kan jag inte förklara, men jag känner vibben och det är något jag kan föra in i min musik och konst." 

 — DN, Mr Mills soul i exil, http://bit.ly/cMVmvV  —
     

— As a child, Pat Duffy told her Dad: "I realized that to make an R all I had to do was first write a P and draw a line down from its loop. And I was so surprised that I could turn a yellow letter into an orange letter just by adding a line."

 Another grapheme synesthete says: "When I read, about five words around the exact one I'm reading are in color. It's also the only way I can spell. In elementary school I remember knowing how to spell the word 'priority' [with an "i" rather than an "e"] because ... an 'e' was out of place in that word because e's were yellow and didn't fit."  -- Accounts of Synesthetes --
     
     

"Most people experience the sensory world as a place of orderly segregation. Sight, sound, smell, taste and touch are distinct and separate: A Beethoven symphony is not pink and azure; the name Angela does not taste like creamed spinach. Yet there are those for whom these basic rules of the senses do not seem to apply. They have a rare condition called Synesthesia, in which the customary boundaries between the senses appear to break down, sight mingling with sound, or taste with touch." 

— The American Synesthesia Association  —  http://bit.ly/cmi4D9

“Twenty years ago, synesthesia — the automatic joining of two or more senses — was regarded by scientists (if at all) as a rare curiosity. Now it may well be the basis for human imagination and metaphor. 

— Richard E. Cytowic http://bit.ly/4INDOw —

— "Kandinsky is painting music. That is to say, he has broken down the barrier between music and painting, and has isolated the pure emotion which, for want of a better name, we call the artistic emotion. Anyone who has listened to good music with any enjoyment will admit to an unmistakable but quite indefinable thrill. He will not be able, with sincerity, to say that such a passage gave him such visual impressions, or such a harmony roused in him such emotions. The effect of music is too subtle for words. And the same with this painting of Kandinsky's.

— Michael Sadler'S introduction to Kandinsky. http://bit.ly/amaLyg —
    

A Dresden doctor relates of one of his patients, whom he designates as an exceptionally sensitive person, and describes that he could not eat a certain sauce without tasting "blue," i.e. without experiencing a feeling of seeing a blue color. The author also discusses the hearing of colour. It would be possible to suggest, by way of explanation of this, that in highly sensitive people, the way to the soul is so direct and the soul itself so impressionable, that any impression of taste communicates itself immediately to the soul, and thence to the other organs of sense (in this case, the eyes). This would imply an echo or reverberation, such as occurs sometimes in musical instruments which, without being touched, sound in harmony with some other instrument struck at the moment. But not only with taste has sight been known to work in harmony. Many colours have been described as rough or sticky, others as smooth and uniform, so that one feels inclined to stroke them. Equally the distinction between warm and cold colours belongs to this connection. Some colours appear soft, others hard, so that even fresh from the tube they seem to be dry. Also unmusical children have been successfully helped to play the piano by quoting a parallel in colour.

— Wassily Kandinsky: "Concerning the Spiritual in Art" (Über das Geistige in der Kunst, 1911)  —

Welcome Emma, the new Superhero on NBC's hit series, "Heroes." Played by Deanne Bray, Emma is a deaf synesthete whose "power" of seeing sound is just beginning to emerge.   

About "Heroes". http://bit.ly/bzJVRZ
     

• Watch a scene from "Heroes": http://www.youtube.com/watch?v=CIzlhcuOqao

• The Synesthesia Battery (a quick test/checklist) http://bit.ly/cwwFib