The half-poetic, half-academic title of the Friday program at the Peter Norton Symphony Space was “Yunnan Revealed: Indigenous Music and Dance From China’s Land of Clouds.” It was full of interesting bits, and everywhere it has been, which is mostly to East Coast colleges, it has been festooned with panels and classroom study and lecture-demonstrations. (The New York stop on the tour, jointly presented by the World Music Institute and the Asia Society, had lecture-demonstrations on Saturday at the American Museum of Natural History.)