If one has been playing(keyboard)for some length of time, having learned by ear, and has reached a plateau, for all the gurus in this forum, I have this question: What single thing would do most to move one ahead? Some possibilities are: practicing various chords and progressions--Listening to songs of a certain type and trying to play them--practicing reading music--Learning to play from a fake book--practicing scales--memorizing as many songs as possible--correspondence courses--getting a teacher and starting over from square one--and on and on. Any comments from the guru section?