Par JOLAS BETSY. 'Almost half a century after 'B for sonata', here is another musical evocation of my intriguing trip to Bali. Yannis Xenakis and Toru Takemitsu were there, among others, and we were walking around in the dark one evening when a Topeng appeared to us, in full action: Balinese musical theatre with one actor successively playing several legendary characters by means of mask changes c…