Hey Maria, in my almost 24 year experience with Oriental Dance and Arabian teachers and musicians, I can tell you one thing: there are so many different interpretations among the Arabs of what is "proper" and "authentic" and what not. Each teacher has her/his own idea about proper techniques and interpretations of music, but there are things in which all agree. So I consider only those things to be the "real" Arabian stuff and I suborder the rest to the teacher who proclaims it, the dancer who dances it, or the area and time it is danced. For example: Dr. Mo Gedawi Arabian basic step, (which is definitely different of what you learn from Momo Kadous, Prof. Hassan Khalil and most of the other Egyptian teachers). Or Dina butt-half circle (I think you know what I mean
). Or modern Cairo knee-shimmy, etc. So don't be surprised if you get confronted with contradictions. This is why I am telling you, that the Egyptian Oriental Dance is a science and you are not going to really understand what is going on, if you haven't dealt in depth with it for at least 15-20 years!