Since I cannot locate a verified major classical work by this exact title in the standard canon (such as by Monteverdi, Vivaldi, or Handel), this may be:
The cinematography relies on deliberate camera placement and specific lighting techniques to establish a particular atmosphere. This approach was common in mid-90s European productions that sought to differentiate themselves through "mood and ambiance" rather than just narrative content. Die Versklavte Ehefrau - Opera Quarta - La Mogl...
Therefore, the keyword likely describes the German adaptation of this Italian work: .