Statistika: works by Tavener 
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Statistika > Heliloojaid > Suurbritannia > Tavener, John
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From the composers database ...
Tavener, John (Kenneth)(1944–2013)
English composer.
compositeur anglais.
compositore inglese.
englischer 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"
Tavener, John (1944-2013)
A Gentle Spirit  (NP) 6-7 Nov 2015; Moscow, Stanislavsky Opera
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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 Tavener (2012/17)
"Performance runs over the five seasons, 2012/13 to 2016/17" Can't read stats1217_workprod.csv ... aborting