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 citing "hostility" from staff members. In May 2005, Stéphane Lissner, formerly head of the Aix-en-Provence Festival, was appointed General Manager and Artistic Director of La Scala, becoming the first non-Italian in its history to hold the office. On 15 May 2006, Daniel Barenboim was named "Maestro Scaligero", or "de facto" principal guest conductor, of the company. In October 2011, Barenboim was appointed the next music director of La Scala, effective December 2011, with an initial contract of 5 years. In December 2013, management named Riccardo Chailly the next music director of La Scala, effective 1 January 2015. Stéphane Lissner left