Opera house electronic libretto systems have begun to be used in some opera houses, including New York's Metropolitan Opera, Milan's La Scala, and the Crosby Theatre of The Santa Fe Opera, which provide two lines of text on individual screens attached to the backs of the seats so as to not interfere with the visual aspects of the performance. A subtle type of sound reinforcement called acoustic enhancement is used in some opera houses. Acoustic enhancement systems help give a more even sound in the hall and prevent "dead spots" in the audience seating area by "...augment[ing] a hall's intrinsic acoustic characteristics."
Fedora (opera) however, operatic tastes had changed, and the opera became performed more sporadically. The 1990s saw a resurgence of interest in "Fedora", with new productions at the Vienna Staatsoper, La Scala, New York's Metropolitan Opera, Chicago Lyric Opera, the Royal Opera House, Covent Garden, the Washington National Opera and the Teatro Colón in Buenos Aires. Notable singers in post-1990 productions include Mirella Freni, Renata Scotto, Agnes Baltsa, Katia Ricciarelli, and Maria Guleghina as Fedora; and Plácido Domingo, José Carreras, and José Cura as Loris. Among "Fedora's" most recent performances are those at the Vienna Staatsoper in 2003, La Scala in 2004,