Statistikk: works by Sommer 
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Statistikk > Komponister > Tyskland > Sommer, Hans
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From the composers database ...
Sommer, Hans(1837–1922)
(personal/ official website)
German composer and mathematician.
compositeur et mathematician allemand.
compositore e mathematician tedesco.
deutscher Komponist und mathematician.
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"
Sommer, Hans (1837-1922)
 www.hans-sommer.de
Rübezahl und der Sackpfeifer von Neiße  18 mar-15 apr 2016; Gera, Theater und Philharmonie Thüringen
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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 Sommer (2012/17)
"Performance runs over the five seasons, 2012/13 to 2016/17" Can't read stats1217_workprod.csv ... aborting