There are so many, each for their own particular things. For instance, Aretha did not write her own music but, man, could she deliver. Edith did the same. Bruce Springsteen wrote and appealed to a whole different side. Tom Waits writes deeply and you have to appreciate his voice in a particular way. Joni Mitchell did not have the greatest voice but I would put her up there with Cohen and Dylan for the breadth and depth. So once I find one, I would then find another, then find another . . .