Opera house as they sing. This occurs in the Met's productions of operas such as "Aida" and "Tales of Hoffman". London's Royal Opera House, which was remodeled in the late 1990s, retained the original 1858 auditorium at its core, but added completely new backstage and wing spaces as well as an additional performance space and public areas. Much the same happened in the remodeling of Milan's La Scala opera house between 2002 and 2004. Although stage, lighting and other production aspects of opera houses often make use of the latest technology, traditional opera houses have not used sound reinforcement systems with microphones
Cologne Opera former mayor of Cologne. The first opera to be performed there was Carl Maria von Weber's "Oberon". In June of that year the house saw its first world premiere, Wolfgang Fortner's "Die Bluthochzeit". The following month the opera company of La Scala appeared there on tour with Maria Callas in "La sonnambula". The Cologne Opera House occasionally hosts solo recitals and special events; one remarkable such event was concert by jazz pianist Keith Jarrett in 1975 which was recorded and became one of the most popular solo jazz piano recordings of all time, known as The Köln Concert. The house