 "Rescue opera" was not a contemporary term.Dyneley Hussey used the term in English in 1927 as a translation of Karl M. Klob's 1913 reference to "Fidelio" as "das sogenannte Rettungs- oder Befreiungsstück" in "Die Oper von Gluck bis Wagner".David Charlton believes that rescue opera is not an authentic genre, and that the concept was coined to make what he believes is a nonexistent connection between Beethoven's work and French opera.