Ok i stopped playing 25 years ago and i started again but just now taking lessons: So today we were going over adding a hex tone (the fourth, right?) to the pentatonic scale. He said did you notice anything about these? I said, "Well the major and minor formations are the same for different notes." He said, "Not if you add the hex tone." I said, "They are if you go from minor pentatonic 1 to major 2 and so forth." He looked at it and said, "Well look at that. I've been teaching for 30 years and never noticed that."