Statistici: works by Robertson 
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Statistici > Compozitori > Canada > Living > Robertson, John
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From the composers database ...
Robertson, (Earnest) John(b.1943)
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Canadian composer.
compositeur canadien.
compositore canadese.
kanadischer 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"
Robertson, John (*1943)
Orpheus  26-27 Feb 2016; Ruse, State Opera Rousse
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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 Robertson (2012/17)
"Performance runs over the five seasons, 2012/13 to 2016/17" Can't read stats1217_workprod.csv ... aborting