Tilastot: works by Xenakis 
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From the composers database ...
Xenakis, Iannis(1922–2001)
http://www.boosey.com/xenakis (other)
Greek, later French, composer, theorist and architect.
compositeur, théoricien et architecte grec puis français.
compositore, teorico e architetto greco, poi francese,.
griechischer, dann französischer Komponist, Theoretiker und Architekt.
From New & Rare 2016/17 ...
"Lyric works designed for staging and classically trained voices, 1 Sep 2016-31 Aug 2017"
"Rare? typically fewer than 13 performance runs in the 5 seasons"
Xenakis, Iannis (1922-2001)
Oresteïa  (concert) 30 maa 2016; Opéra de Rennes
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From New & Rare 2017/18 ...
"Lyric works designed for staging and classically trained voices, 1 Sep 2017-31 Aug 2018"
"Rare? typically fewer than 13 performance runs in the 5 seasons"
No entry found for this time period
From the statistics ... works by Xenakis (2012/17)
"Performance runs over the five seasons, 2012/13 to 2016/17" Can't read stats1217_workprod.csv ... aborting