interesting - there is a whole area of study of bistable figuresIncarnateX wrote:Thank you for the link. Here is an example of the ambiguity in polyrhythms I am talking about. This is a westafrican polyrhythm starting with a pulze of 6 over 4, where he first emphasizes 4 as basic pulze, then the 6 as basic pulze and then he triples the 6, which adds a new feeling to the rhythm. It is wonderful.
He explains what is happening starting from 1.10
http://youtu.be/g8Lr-704aCs
and his talk reminds me of that but I've not seen anything on bistable musical material such as that drummer talks about (there's stuff on melodic bistability I vaguely remember but can't remember anything on bistable grooves - auditory stream analysis is the area to look in)