Because of the genre, it was impossible to tell if he was winging it from then on or if this "accident" was part of the performance?
So, of Xenakis' 3 concertos for piano and orchestra, it's none of them?
Maybe it was one of the pieces for piano and ensemble, like Eonta? I don't know when that was written. And yeah, are you sure it was Roger Woodward? I just can't imagine him with a fro, even in the 70s.
I've performed the piano sections of Synaphai and Erikhthon while flipping the pages myself so it is possible. Please acquire a better technique before you start spouting shit.
If it was Xenakis then it must have been Synaphai. Erikhthon was premiered in May of '74.There is a performance of Synaphai on youtube: He turns the pages as he plays!mp3 here: https://www.pianostreet.com/smf/index.php/topic,18353.0.htmlignore the 8 page discussion because it will make you dumb