When I saw the thread title I thought it could only be Jimmy Smith - the true bad boy of the organ: https://www.youtube.com/watch?v=gobKu4UlxSA Peerless!
What is there that hasn't been said about Jimmy Smith? He can even make slushy ballads listenable. There can't be many examples of where one guy stands head and shoulders above the other players of the instrument. Hendrix, maybe?