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."
La Scala, Fortitude Valley criteria. The place is important in demonstrating the evolution or pattern of Queensland's history. La Scala is significant as it demonstrates innovative architectural ideas including the large roofdeck for outdoor living, the free planforms linked via the stairwell bay, and the stylistic innovation in the use of decorative elements and materials. La Scala is significant for the unusual scale and form of the building and retaining walls and the contribution these elements make to the Brunswick Street streetscape. Also significant is the aesthetic quality of decorative elements including plaster ceilings, timber batten detailing, leadlight panels and timber work. La Scala