1999-2001 timeframe for a couple school projects (1 high school, the other college)I was fascinated because I had/have it (much weaker now than when I as younger, which is normal)Anyway, its widely suspected by people who study synaesthesia that it's way more common than reported.Kanye could have it in some form, but then again it would be like Kanye to just claim some stuff like that without actually having it lol