For me, Roy Orbison. Didn't like him when I was a teenager, but love his voice now. I think what switched me over was listening to The Traveling Wilburys (End of the Line) where you can hear his voice through all the others - very distinctive and a wonderful quality. Otherwise, the stuff I liked then, I like now, and the stuff I didn't like, I still don't, mostly. For some reason, I never 'got' Van Morrison.