What did Vladimir Nabokov and Jimi Hendrix have in common?

The weird Thought of the Day for today is this one, from Dancing Bear's Blog

In Speak, Memory, Nabokov gives a run-down of his synaesthesia - an odd condition that caused him to associate each letter of the alphabet with a different colour. Thus the letter a made him think of "the tint of weathered wood"; b "the tone called burnt sienna by painters," and so on. The only time I'd heard of this kind of thing before was in connection with Hendrix, who saw musical tones as colours. One especially bitchin' chord - E7#9, otherwise known as the Hendrix chord - induced him to see a purple haze: hence the title of the song. So there you go. And do you remember what Lolita's last name was? Haze.