Ombra: Supernatural Music in the Eighteenth Century - Clive McClelland - Google Books

https://books.google.de/books?id=VcGo4PlD1v4C&pg=PA146

Ombra is the term which applies to an operatic scene involving the appearance of an oracle or demon, witches, or ghosts. Such scenes can be traced back to the early days of opera and were commonplace in the seventeenth century in Italy and France. Operas…