Performing groups O

Opettajien kamarikuoron mieslaulajaryhmä Performing group
Orchestre Colonne (Pariisi) Performing group
Orquesta de camara de Madrid Performing group
Orquesta estable del teatro Argentino Performing group
Orquesta filarmonica de Buenos Aires Performing group
Orquesta filarmonica de Madrid Performing group
Orquesta filarmonica municipal (Santiago de Chile) Performing group
Orquesta sinfonica de Malaga Performing group
Orquesta sinfonica municipal de Valencia Performing group
Orquestra do teatro municipal do Rio de Janeiro Performing group
Orquestra Sinfônica Municipal (Sao Paulo) Performing group