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."
Rudy La Scala certification in Venezuela. La Scala produced "The Witch", Ambar's second album in 1980; the same year he also produced "Que Nota" for the singer Stella. In 1983, an album written and produced by La Scala, and performed by Arturo Vázquez was released. The theme song for the 1985 soap opera "Cristal", "Mi Vida Eres Tú", was written and performed by La Scala. "Cristal" and the song became very successful in Latin America and Spain. The song was included in La Scala's album "Volvamos a Vivir", which peaked at number two in the "Billboard" Latin Pop Albums chart in United States.