Statistika: works by Gruber 
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Statistika > Kompozitoriais > Austrija > Living > Gruber, H K
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From the composers database ...
Gruber, H(einz) K(arl)(b.1943)
http://www.boosey.com/Gruber (other)
  (no contact information on file)
Austrian composer, bass-player and singer.
compositeur, bass-player et chanteur autrichien.
compositore, bass-player e cantante austriaco.
österreichischer Komponist, bass-player und Sänger.
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"
Gruber, H K (*1943)
 www.boosey.com/Gruber
Geschichten aus dem Wiener Wald  22 Geg-7 Liep 2016; Komische Oper Berlin
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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 Gruber (2012/17)
"Performance runs over the five seasons, 2012/13 to 2016/17" Can't read stats1217_workprod.csv ... aborting