This book is supposed to have good info on the origins and cultural contexts of different forms of dance, and it was cheaper on Amazon than the $300, out-of-print Tribal Bible. Perhaps if I knew about tribal and folkloric dances in more historical detail, I would better be able to appreciate some of the information, but it's not well presented and mostly reflects interests that are not my own. Apparently people who bellydance just want to do it, not write about it--there's not much out there.