Statistics: works by Ligeti 
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Statistics > Composers > Hungary > Ligeti, György
Permalink: operabase.com/visual.cgi?season=2016&is=opera&by=Ligeti
From the composers database ...
Ligeti, György (Sándor)(1923–2006)
Hungarian composer.
compositeur hongrois.
compositore ungherese.
ungarischer Komponist.
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"
Ligeti, György (1923-2006)
Aventures, nouvelles aventures  (NP) 14-24 Nov 2015; Berlin, Staatsoper im Schiller Theater
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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 Ligeti (2012/17)
"Performance runs over the five seasons, 2012/13 to 2016/17" Can't read stats1217_workprod.csv ... aborting