Statistik: works by Kostov 
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Statistik > Komponister > Bulgarien > Living > Kostov, Georgi
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From the composers database ...
Kostov, Georgi(b.1941)
http://www.ubc-bg.com/en/composer/46 (other)
  (no contact information on file)
Bulgarian composer, pedagogue and politician.
compositeur, pédagogue et politicien bulgare.
compositore, pedagogo e politico bulgaro.
bulgarischer Komponist, Pädagoge und Politiker.
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"
Kostov, Georgi (*1941)
Casanova  22 Jan-27 Maj 2016; Ruse, State Opera Rousse
Click on a theatre/ company name for full dates, production team and cast information
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 Kostov (2012/17)
"Performance runs over the five seasons, 2012/13 to 2016/17" Can't read stats1217_workprod.csv ... aborting