Statistik: works by Kollo 
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Statistik > Komponister > Tyskland > Kollo, Willi
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From the composers database ...
Kollo, Willi(1904–1988)
German composer and +.
compositeur et + allemand.
compositore e + tedesco.
deutscher Komponist und +.
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"
Kollo, Willi (1904-1988)
Wie einst im Mai  29 Okt-16 Jan 2015; Staatstheater Cottbus
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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 Kollo (2012/17)
"Performance runs over the five seasons, 2012/13 to 2016/17" Can't read stats1217_workprod.csv ... aborting