Ahhh.... the old " Musc/teach. " conflict. I dont believe we are in dis-agreement . I did stipulate that, EVERY dance has roots, and those roots are seldom portrayed in their true indigenous form, as they would not " sell ",so Im not dis-agreeing with you ,about going back to the year Dot . BUT , todays compositions, are still founded in those roots. Son, as we know is a comparative new kid on the "block " compared to the time of the " drum " and pretty much all dance forms were solo. And, my memory does go back ( a LOT farther than yrs, considering my age !! ) To remember, I must speak in context, of HOW those rhythms have been transposed to suit the general public. There are still some hardcore salsero/s, who are insistant about developing indigenous Rumba, as an integral part of salsa .There are even bands who are closer to their musical roots ( all the Son " soneros " that, dont go over very well with the club types ) . As a teacher, I may only talk in absolutes, about the dance music that is played today,and its recent evolution , and to "take " it back to the 17th century ,serves no real purpose in a " dance " discussion of todays dance/ music, "roots " ?; do I inject some of this yes ?, of course, but only in a somewhat superficial way in my teachings. All the musical textbook stuff, is more for academics ( and music nerds, like me ). Your claim about being a musician, always reminds me of a comment, that a well known band leader made.. " I dont know what the hell they are dancing to, but its not what we are playing ! " by the way.. do you know who made the Bolero ( the dance ) popular ?.