Statistics: works by Stefani 
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Statistics > Composers > Polen > Stefani, Jan
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From the composers database ...
Stefani, Jan(1746–1829)
Polish composer.
compositeur polonais.
compositore polacco.
polnischer 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"
Stefani, Jan (1746-1829)
Cud mniemany  19 Sep-5 Apr 2015; Warszawa, Polish National 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 Stefani (2012/17)
"Performance runs over the five seasons, 2012/13 to 2016/17" Can't read stats1217_workprod.csv ... aborting