|
|
Opéra national du Rhin. Chœurs,
|
|
3
|
|
|
|
1
|
|
|
|
1
|
|
Opera North
|
|
2
|
|
Opera North. Chorus.
|
|
7
|
|
|
|
1
|
|
Opera Orchestra, Berlin-Charlottenburg -- See Städtische Oper Berlin
|
|
1
|
|
Opera Orchestra of New York.
|
|
8
|
|
|
|
1
|
|
Opéra (Paris, France) -- See Opéra de Paris
|
|
1
|
|
Opera Rara Chorus,
|
|
4
|
|
Opera Rara (Firm)
|
2007
|
1
|
|
|
|
1
|
|
|
|
1
|
|
Opéra royal de Versailles. Orchestre, / instrumentalist.
|
2021
|
1
|
|
Opéra royal de Wallonie, / performer.
|
2008
|
1
|
|
|
|
1
|
|
|
|
1
|
|
Opera Saratoga, / commissioning body.
|
2020
|
1
|
|
|
|
1
|
|
Opera Society of Washington,
|
|
3
|
|
|
|
1
|
|
Opera Stravagante, / performer.
|
2014
|
1
|
|
|
|
1
|
|
Opera Theatre of Rochester. Chorus. / Performer.
|
1999
|
1
|
|
Opera Theatre of Saint Louis, / sponsoring body.
|
2015
|
1
|
|
Opera Unlimited.
|
2006
|
1
|
|
|
|
1
|
|
Opera World (Firm)
|
1982
|
1
|
|
Opera Wrocławska. / Performer.
|
2009
|
1
|
|
|
|
1
|
|
|
|
1
|
|
|
|
1
|
|
|
|
1
|
|
Operational and Law Enforcement Workforce Resiliency (Workshop) (2011 : Washington, D.C.)
|
2012
|
1
|
|
|
|
1
|
|
|
|
1
|
|
|
|
1
|
|
Operational Research Society (Great Britain)
|
1965
|
1
|
|
Operations Research Society of America.
|
|
3
|
|
|
|
1
|
|
|
|
1
|
|
|
|
1
|
|
|
|
1
|
|
|
|
1
|
|
|
|
1
|
|
Opernhaus Zürich,
|
|
14
|
|
Opernhaus Zürich. Ballett -- See Zürcher Ballett
|
|
1
|
|
Opernhaus Zürich. Chor -- See Also the later heading Chor der Oper Zürich
|
|
1
|
|
Opernhaus Zürich. Chor,
|
|
9
|
|