If they think they are doing something new, they ought to do what I do every day - spend at least two hours every day listening to Johann Sebastian Bach and, man, it's all there. If they want to improvise around a theme,which is the essence of jazz, they should learn from the master. He never wastes a note, and he knows where every note is going and when to bring it back. Some of these cats go way out and forget where they began or what they started to do. Bach will clear it up for them.